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The posterior cruciate ligament ( PCL ) is a ligament in each knee of humans and various other animals. It works as a counterpart to the anterior cruciate ligament (ACL). It connects the posterior intercondylar area of the tibia to the medial condyle of the femur . This configuration allows the PCL to resist forces pushing the tibia posteriorly relative to the femur.

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95-461: A ball-up (pl. ball-ups ) in Australian rules football is the method by which the field umpire restarts play at a neutral contest after a stoppage within the field of play. It involves the throwing or bouncing of the ball up between two players, known as rucks , who then attempt to win possession for their teams. A related type of contest, the boundary throw-in , occurs to restart play after

190-638: A dominion , leagues were also established in the major cities. This renewed popularity helped encourage the formation of the Australasian Football Council , which in 1908 in Melbourne staged the first national interstate competition, the Jubilee Australasian Football Carnival , with teams representing each state and New Zealand. The game was also established early on in the new territories. In

285-454: A PCL injury: With these grades of PCL injuries, there are different treatments available for such injuries. In this position, the PCL functions to prevent movement of the tibia in the posterior direction and to prevent the tilting or shifting of the patella. However, the respective laxity of the two sections makes the PCL susceptible to injury during hyperflexion , hyperextension , and in

380-446: A bounce, the umpire throws the ball firmly on the ground such that it bounces several metres up into the air approximately, although not always perfectly, vertically. In both cases, the ball is then contested by the teams' ruckmen, which is known as a ruck contest . Generally, the ruckmen try to jump and tap the ball down to one of the team's rovers. To that end, the height to which the ball is thrown or bounced needs to be at least above

475-412: A central and outer post (worth one point, otherwise known as a "behind"). During general play, players may position themselves anywhere on the field and use any part of their bodies to move the ball. The primary methods are kicking , handballing and running with the ball. There are rules on how the ball can be handled; for example, players running with the ball must intermittently bounce or touch it on

570-517: A century. State of Origin rules, introduced in 1977, stipulated that rather than representing the state of their adopted club, players would return to play for the state they were first recruited in. This instantly broke Victoria's stranglehold over state titles and Western Australia and South Australia began to win more of their games against Victoria. Both New South Wales and Tasmania scored surprise victories at home against Victoria in 1990. The term " Barassi Line ", named after VFL star Ron Barassi ,

665-537: A common cause of posterior cruciate ligament injuries for ruckmen in the early years of the 21st century. In addition to introducing the 10m circle to limit run-up length, free kicks were introduced against ruckmen leading with a raised knee. In the 1999 preseason , rubber pads were installed in the very centre of the AFL venues to give the umpires a reliable surface for centre bounces. These were quickly removed after Adelaide ruckman Shaun Rehn slipped on one and suffered

760-539: A feature of the Laws of the Game since 1872; prior to this, a scrimmage would be allowed to continue until the ball was won. Ball-ups were originally thrown, but bouncing had become common from as early as 1880; the rules formally changed to a mandate a bounce in 1887. A boundary throw-in occurs to restart play after the ball goes out of bounds. The boundary umpire stands at the point where the ball went out of bounds, back turned

855-419: A game for either medical or tactical reasons. Players on the playing surface can be swapped with those on the interchange bench at any time. They must though pass through a designated "Interchange Area". In the event a player fails to pass through this area correctly, or if too many players from one team are found to be on the ground at a time, a free kick will be awarded to the opposing side. While there

950-703: A game more suited to adults and Australian conditions, the Melbourne Football Club published the first laws of Australian football in May 1859. Australian football has the highest spectator attendance and television viewership of all sports in Australia, while the Australian Football League (AFL), the sport's only fully professional competition, is the nation's wealthiest sporting body. The AFL Grand Final , held annually at

1045-426: A graft taken from the hamstring or Achilles tendon from a host cadaver. An arthroscope allows a complete evaluation of the entire knee joint, including the knee cap (patella), the cartilage surfaces, the meniscus, the ligaments (ACL & PCL), and the joint lining. Then, the new ligament is attached to the bone of the thigh and lower leg with screws to hold it in place. Surgery to repair the posterior cruciate ligament

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1140-399: A mark is taken, a small protected zone is established on the field, extending 10 metres (11 yd) either side of "the mark" and the player who marked the ball, with a small protected corridor between "the mark" and the player. The opposition player is permitted to jump, but is not allowed to move from their position on "the mark". Any other movements result in a distance penalty (50 metres in

1235-443: A mechanism known as a dashboard injury. Because ligaments are viscoelastic ) they can handle higher amounts of stress only when the load is increased slowly. When hyperflexion and hyperextension occur suddenly in combination with this viscoelastic behavior, the PCL deforms or tears. In the third and most common mechanism, the dashboard injury mechanism, the knee experiences impact in a posterior direction during knee flexion toward

1330-422: A player breaks a rule, a free kick is awarded to the opposing team, from the location that the misconduct occurred, or the ball's current location—whichever is closer to the team's scoring zone. As when a mark is taken, this location is called "the mark", and the same protections regarding the space apply. Posterior cruciate ligament The PCL and ACL are intracapsular ligaments because they lie deep within

1425-566: A proposed hybrid code of Australian football and rugby league , the predominant code of football in New South Wales and Queensland, was trialled without success. In Queensland, the state league went into recess for the duration of the war. VFL club University left the league and went into recess due to severe casualties. The WAFL lost two clubs and the SANFL was suspended for one year in 1916 due to heavy club losses. The Anzac Day match ,

1520-888: A pupil at Rugby School in England, and returned to his homeland a star athlete and cricketer. Two weeks later, Wills' friend, cricketer Jerry Bryant , posted an advertisement for a scratch match at the Richmond Paddock adjoining the Melbourne Cricket Ground (MCG). This was the first of several "kickabouts" held that year involving members of the Melbourne Cricket Club , including Wills, Bryant, W. J. Hammersley and J. B. Thompson . Trees were used as goalposts and play typically lasted an entire afternoon. Without an agreed-upon code of laws, some players were guided by rules they had learned in

1615-505: A second-tier status. The VFA merged with the former VFL reserves competition in 1998, adopting the VFL name. State of Origin also declined in importance, especially after an increasing number of player withdrawals. The AFL turned its focus to the annual International Rules Series against Ireland in 1998 before abolishing State of Origin the following year. State and territorial leagues still contest interstate matches, as do AFL Women players. In

1710-413: A select few ways as defined by the Laws of Australian Football, published by the AFL. The ball can be propelled in any direction by way of a kick or a clenched fist (called a handball )—deemed a correct disposal. Failure to dispose of the ball in one of these two methods will result in a free kick to the opposing team. If the ball is not currently in a player's possession, it can be moved legally through

1805-403: A serious knee injury. Australian rules football Australian rules football , also called Australian football or Aussie rules , or more simply football or footy , is a contact sport played between two teams of 18 players on an oval field , often a modified cricket ground . Points are scored by kicking the oval ball between the central goal posts (worth six points), or between

1900-620: A similar situation existing in Western Australia in the sport, the VFL pursued a more national competition. Two more non-Victorian clubs, West Coast and Brisbane , joined the league in 1987 generating more than $ 8 million in license revenue for the Victorian clubs and increasing broadcast revenues which helped the Victorian clubs survive. In their early years, the Sydney and Brisbane clubs struggled both on and off-field because

1995-498: A slightly modified version of the Victorian game in 1879. The South Australian Football Association (SAFA), the sport's first governing body , formed on 30 April 1877, firmly establishing Victorian rules as the preferred code in that colony. The Victorian Football Association (VFA) formed the following month. Clubs began touring the colonies in the late 1870s, and in 1879 the first intercolonial match took place in Melbourne between Victoria and South Australia . To standardise

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2090-406: A technique known shepherding when the ball is within 5 metres (5.5 yd) of an opposition player. Shepherding involves the use of a player's body to push, bump or otherwise block an opposition player, providing they do not have possession of the ball. If a player takes possession of the ball that has travelled more than 15 metres (16 yd) from another player's kick, by way of a catch within

2185-427: A uniform code known as "Victorian rules". In 1866, the "first distinctively Victorian rule", the running bounce , was formalised at a meeting of club delegates chaired by H. C. A. Harrison , an influential pioneer who took up football in 1859 at the invitation of Wills, his cousin. The game around this time was defensive and low-scoring, played low to the ground in congested rugby-style scrimmages. The typical match

2280-403: A way that it does not create a fair contest between the two ruckman, stopping play and re-setting the players to execute a second ball-up by throw. Rules allowing for errant or skewed bounces to be recalled were also introduced only in the 21st century, with bad bounces considered a variable of the game prior to this. The centre bounce was introduced to the Laws of the Game in 1891. Prior to this,

2375-405: Is analogous to a basketball center and as such rucks are typically the tallest player on the team. Lifting teammates is not allowed so the ruck may only jump to reach the ball. If the ruck does not take possession of the football, it must must be tapped or fisted, which is known as a hit-out. An effective hit-out that passes the ball to a teammate is known as a hit-out to advantage. In the event

2470-670: Is approximately 1 cm, but is decreased (Grade I) or even absent (Grade II) or inverse (Grade III) in injuries to the posterior cruciate ligament. The posterior drawer test is one of the tests used by doctors and physiotherapists to detect injury to the PCL. Patients who are suspected to have a posterior cruciate ligament injury should always be evaluated for other knee injuries that often occur in combination with an PCL injuries. These include cartilage/ meniscus injuries, bone bruises, ACL tears, fractures, posterolateral injuries and collateral ligament injuries. There are four different grades of classification in which medical doctors classify

2565-418: Is controversial due to its placement and technical difficulty. It is possible for the PCL to heal on its own without surgery when it is a Grade I or Grade II injury. PCL injuries that are diagnosed in these categories can have their recovery times reduced by performing certain rehabilitative exercises. Fernandez and Pugh(2012) found that following a PCL grade II diagnosis, a multimodal treatment that spanned

2660-481: Is known about these early one-off games, evidence does not support a causal link with Australian football. In Melbourne , in 1858, in a move that would help to shape Australian football in its formative years, private schools (then termed " public schools " in accordance with nomenclature in England) began organising football games inspired by precedents at English public schools . The earliest match, held on 15 June,

2755-460: Is known as the Goal Line. Around the perimeter of the field, two white lines are drawn between the set of behind posts in an arc-shape, marking the field of play. Other field markings include: The 50m arcs, centre square, centre circle and goal square are used at the beginning of each quarter or after each goal. With each team permitted a maximum of six players in each 50m arc, with one in

2850-470: Is no set uniform, the basic equipment for Australian football consists of a guernsey, shorts, socks and boots, with additional pieces of apparel such as headbands and gloves additionally being permitted. Players may wear certain pieces of protective equipment, such as helmets or arm guards, if approved by the relevant controlling body. Mouthguards are strongly recommended for all players. Players are not permitted to wear jewellery, or other materials which

2945-493: Is officiated by at least five match officials, known as an umpire . These match officials are placed into three categories based upon their roles and responsibilities, with varying minimum numbers of Umpires required depending on position: At AFL level, a video score review system is utilised. Only umpires are permitted to request a review, and only scoring shots and potential scoring shots are permitted to be reviewed. An Australian rules football may only be propelled forward in

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3040-413: Is staged at the beginning of each quarter and after each goal. A general ball-up is staged after all other neutral stoppages in play, with the exception of after the ball goes out of bounds, which is restarted by a boundary throw-in . The rules governing a centre bounce differ from those of a general ball-up. A ball-up may be contested by only one player (generally the ruckman) from each team, nominated by

3135-783: Is used. The ball must be inflated to a pressure of 69 kilopascals (10.0 pounds per square inch). There are no defined laws regarding what material a ball must be made from, but standard AFL match-used balls are produced by Sherrin using cowhide leather. While there is no standard colour of the ball, red and yellow are most common and the only colours used at AFL level. Yellow is used for games beginning after 3 pm or in an enclosed stadium, due to its greater visibility, and to assist score reviews. Unlike other forms of football which are played on rectangular fields, Australian rules football playing fields are oval-shaped, and are between 135 and 185 metres (148 and 202 yd) long and 110 and 155 metres (120 and 170 yd) wide. At either end of

3230-405: Is usually physiotherapy to strengthen the muscles around the knee; usually they provide adequate stability even without a functional PCL. Only if there are ongoing symptoms down the track, or if there are other injuries in the knee (e.g. posterolateral corner injury) will ligament reconstruction be required. Ligament reconstruction is used to replace the torn PCL with a new ligament, which is usually

3325-595: The Melbourne Cricket Ground , is the second-highest-attended club championship event in the world . The sport is also played at amateur level in many countries and in several variations . Its rules are governed by the AFL Commission with the advice of the AFL's Laws of the Game Committee. Australian rules football is known by several nicknames, including Aussie rules, football and footy. In some regions, where other codes of football are more popular,

3420-401: The anterior cruciate ligament , the PCL connects the femur to the tibia . Common causes of injuries are direct blows to the flexed knee, such as the knee hitting the dashboard in a car accident or falling hard on the knee, both instances displacing the tibia posterior to the femur. An additional test of posterior cruciate ligament injury is the posterior sag test , where, in contrast to

3515-407: The field umpire has deemed to be either potentially dangerous or increase the risk of injury to other players. Australian rules football is played with an ellipsoid ball, between 72 and 73 cm (28 and 29 in) in long circumference, and 54.5 and 55.5 cm (21.5 and 21.9 in) in short circumference. For women's competitions, a smaller ball size of 69 and 53 cm (27 and 21 in)

3610-461: The tibia , during movement. It originates from the lateral edge of the medial femoral condyle and the roof of the intercondyle notch then stretches, at a posterior and lateral angle, toward the posterior of the tibia just below its articular surface. Although each PCL is a unified unit, they are described as separate anterolateral and posteromedial sections based on where each section's attachment site and function. During knee joint movement,

3705-612: The 2010s, the AFL signalled further attempts at expanding into markets outside Australian football's traditional heartlands by hosting home-and-away matches in New Zealand, followed by China. After several failed bids since the early 1990s for a Tasmania-based AFL team, the Tasmania Football Club secured the 19th AFL license in 2023, and is set to compete by 2028. In a standard match, a team may consist of anywhere between 14 and 18 players who may be permitted on

3800-464: The AFL). The player who was awarded the mark may then choose to either dispose of the ball over "the mark" or may choose to attempt disposal via a different method, in which case the field umpire will call "play on"—a verbal instruction to continue play. "Play on" may also be called if the umpire deems the player awarded the mark to be taking an unreasonable amount of time to dispose of the football. Once

3895-472: The AFLW using 17 minutes per quarter. For any given match, two timekeepers are appointed to officiate the duration. The timekeepers record all relevant statistics for the match, such as total quarter duration and score by each team. Additionally timekeepers are required to sound a siren prior to and at the conclusion of each quarter until such time they are acknowledged by the field umpires. To stop and recommence

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3990-641: The ANFC, and later the Australian Football Championships (AFC) ran a night series , which invited clubs and representative sides from around the country to participate in a knock-out tournament parallel to the premiership seasons, which Victorian sides still dominated. With the lack of international competition, state representative matches were regarded with great importance. Due in part to the VFL poaching talent from other states, Victoria dominated interstate matches for three-quarters of

4085-539: The British Isles, "others by no rules at all". Another milestone in 1858 was a 40-a-side match played under experimental rules between Melbourne Grammar and Scotch College , held at the Richmond Paddock. Umpired by Wills and teacher John Macadam , it began on 7 August and continued over two subsequent Saturdays, ending in a draw with each side kicking one goal. It is commemorated with a statue outside

4180-583: The Irish game evolved in a similar direction. Another theory, first proposed in 1983, posits that Wills, having grown up among Aboriginals in Victoria, may have seen or played the Aboriginal ball game of Marn Grook , and incorporated some of its features into early Australian football. There is only circumstantial evidence that he knew of the game, and according to biographer Greg de Moore's research, Wills

4275-752: The MCG at the Parade Hotel, owned by Bryant, and drafted ten rules: "The Rules of the Melbourne Football Club" . These are the laws from which Australian football evolved. The club aimed to create a simple code suited to the hard playing surfaces around Melbourne, and to eliminate the roughest aspects of English school games—such as "hacking" (shin-kicking) in Rugby School football—to reduce the risk of injuries to working men. In another significant departure from English public school football,

4370-503: The MCG, and the two schools have since competed annually in the Cordner–Eggleston Cup , the world's oldest continuous football competition . Since the 1920s, it has been suggested that Australian football may have been derived from the Irish sport of Gaelic football . However, there is no archival evidence in favour of a Gaelic influence, and the style of play shared between the two modern codes appeared in Australia long before

4465-576: The Melbourne rules omitted any offside law . "The new code was as much a reaction against the school games as influenced by them", writes Mark Pennings. The rules were distributed throughout the colony; Thompson in particular did much to promote the new code in his capacity as a journalist. Following Melbourne's lead, Geelong and Melbourne University also formed football clubs in 1859. While many early Victorian teams participated in one-off matches, most had not yet formed clubs for regular competition. A South Yarra club devised its own rules. To ensure

4560-479: The PCL rotates such that the anterolateral section stretches in knee flexion but not in knee extension and the posteromedial bundle stretches in extension rather than flexion. The function of the PCL is to prevent the femur from sliding off the anterior edge of the tibia and to prevent the tibia from displacing posterior to the femur. The posterior cruciate ligament is located within the knee. Ligaments are sturdy bands of tissues that connect bones. Similar to

4655-409: The SANFL's Port Adelaide (1997), the only pre-existing club outside Victoria to join the league. In 2011 and 2012, respectively, two new non-Victorian clubs were added to the competition: Gold Coast and Greater Western Sydney . The AFL, currently with 18 member clubs, is the sport's elite competition and most powerful body. Following the emergence of the AFL, state leagues were quickly relegated to

4750-581: The annual game between Essendon and Collingwood on Anzac Day, is one example of how the war continues to be remembered in the football community. The role of the Australian National Football Council (ANFC) was primarily to govern the game at a national level and to facilitate interstate representative and club competition. In 1968, the ANFC revived the Championship of Australia , a competition first held in 1888 between

4845-582: The back ), interference when marking, and deliberately slowing the play are discouraged with free kicks, distance penalties , or suspension for a certain number of matches depending on the severity of the infringement. The game features frequent physical contests, spectacular marking , fast movement of both players and the ball, and high scoring. The sport's origins can be traced to football matches played in Melbourne , Victoria , in 1858, inspired by English public school football games . Seeking to develop

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4940-460: The ball has gone out of bounds. It is governed by similar rules, although is not itself known as a ball-up. Ball-ups have been part of the Laws of the Game since 1872. Ball-ups are the equivalent of a jump ball , faceoff or dropped-ball from other team sports. There are two means of executing a ball-up: a throw or a bounce. For a throw, the field umpire throws the ball vertically upwards. For

5035-421: The ball was kicked off from the centre of the ground by the team who was scored upon (or, as determined by the coin toss at start of the game). The skill of being able to bounce an obloid-shaped ball vertically upwards on a grass surface is unique to Australian rules football, and is much loved by traditionalists. However, it is very difficult to master, and it is blamed for deterring aspiring umpires from pursuing

5130-441: The ball-ups in the centre of the ground at the start of each quarter and after each goal is scored executed by bounce – this type of ball-up known as a centre bounce . An umpire may also elect to throw instead of bounce if soft or wet ground conditions preclude bouncing; prior to 2013, soft ground condition was generally the only reason for throwing the ball, with the bounce standard at all ball-ups. A centre bounce (or centre throw)

5225-437: The ball; but once the ball is in flight, they may engage in the ruck contest. A free kick is awarded in a ruck contest if a player: The rule requiring that only one ruckman from each team contest the ball was introduced in 2017. Prior to this, a common strategy was for one ruckman to block the other while a team-mate entered the ruck contest and won the tap-out, becoming what was known as a third man up . The ball-up has been

5320-442: The case of Sydney , denial of access to grounds, the influence of university headmasters from Britain who favoured rugby, and the loss of players to other codes inhibited the game's growth. In 1896, delegates from six of the wealthiest VFA clubs— Carlton , Essendon , Fitzroy , Geelong, Melbourne and South Melbourne —met to discuss the formation of a breakaway professional competition. Later joined by Collingwood and St Kilda ,

5415-409: The centre bounce. The centre line was introduced in 1982 to prevent players from wrestling prior to the bounce. The 10m circle was introduced in 2005 to limit the length of the ruckmen's run-ups, as posterior cruciate ligament injuries caused by front-on knee clashes at centre bounces had become a common problem over the previous years. An umpire may recall an errant centre bounce which skews in such

5510-435: The clock, the field umpires are required to signal to the timekeepers to indicate when the clock should be stopped or restarted. Between each quarter, a break is observed to allow players a rest period. Two six-minute breaks are observed between the first and second quarters, and the third and fourth quarters. A longer 20-minute break is observed between the second and third quarter, commonly known as half-time . Each game

5605-504: The clubs formed the Victorian Football League (VFL), which held its inaugural season in 1897 . The VFL's popularity grew rapidly as it made several innovations, such as instituting a finals system, reducing teams from 20 to 18 players, and introducing the behind as a score. Richmond and University joined the VFL in 1908, and by 1925, with the addition of Hawthorn , Footscray and North Melbourne , it had become

5700-490: The code took hold during a series of gold rushes . Likewise, when New Zealand experienced a gold rush , the sport arrived with a rapid influx of Australian miners. Now known as Australian rules or Australasian rules, the sport became the first football code to develop mass spectator appeal, attracting world record attendances for sports viewing and gaining a reputation as "the people's game". Australian rules football reached Queensland and New South Wales as early as 1866;

5795-507: The course of 8 weeks consisting of chiropractic lumbopelvic manipulation, physiotherapy , and implementing an exercise program that emphasized eccentric muscle contraction ( lunges , 1-leg squats, and trunk stabilization proved to be an effective way to recover from the PCL injury. For Grades III and IV, operative surgery is recommended or is usually needed. Grafts is the method when addressing PCL injuries that are in need of operative surgery. With grafts, there are different methods such as

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5890-400: The drawer test, no active force is applied. Rather, the person lies supine with the leg held by another person so that the hip is flexed to 90 degrees and the knee 90 degrees. The main parameter in this test is step-off , which is the shortest distance from the femur to a hypothetical line that tangents the surface of the tibia from the tibial tuberosity and upwards. Normally, the step-off

5985-409: The field of play, it is deemed as a mark . To be awarded a mark, it must be deemed that the player sufficiently controlled the ball and took possession prior to it being touched, touching the ground, or in the case of a contest, being spoiled by an opponent. Upon a mark being taken, one opposition player may choose to stand on the point on the field where the mark was taken, known as "the mark". When

6080-413: The field, two sets of posts are erected in a straight line to indicate the scoring areas on the field, each with two kinds of posts, named the goal posts and the behind posts respectively. The goal posts are placed first, located 6.4 metres (7.0 yd) apart from each other, with a behind post being placed a further 6.4 metres to the side of each goal post. The name for the field line between two goal posts

6175-627: The first match in Darwin . The game went on to become the most popular sport in the Territory and build the highest participation rate for the sport nationally. Both World War I and World War II had a devastating effect on Australian football and on Australian sport in general. While scratch matches were played by Australian " diggers " in remote locations around the world, the game lost many of its great players to wartime service. Some clubs and competitions never fully recovered. Between 1914 and 1915,

6270-536: The formation of the Adelaide Football Club , the oldest football club in Australia outside Victoria. It devised its own rules, and, along with other Adelaide -based clubs, played a variety of codes until 1876, when they uniformly adopted most of the Victorian rules, with South Australian football pioneer Charles Kingston noting their similarity to "the old Adelaide rules". Similarly, Tasmanian clubs quarrelled over different rules until they adopted

6365-435: The goal square and four players in the centre square with one in the centre circle. If this is breached, a free kick is awarded. A game lasts for 80 minutes, split into four-quarters consisting of 20 minutes playing time, with the clock being stopped for stoppages in play such as scores, or at the umpire 's discretion, e.g. for serious injury. Leagues may choose to employ shorter quarters of play at their discretion, such as

6460-519: The ground . Throwing the ball is not allowed, and players must not get caught holding the ball . A distinctive feature of the game is the mark , where players anywhere on the field who catch the ball from a kick (with specific conditions) are awarded unimpeded possession . Possession of the ball is in dispute at all times except when a free kick or mark is paid. Players can tackle using their hands or use their whole body to obstruct opponents. Dangerous physical contact (such as pushing an opponent in

6555-487: The job, or hindering competent decision-makers from reaching the top levels of umpiring. The bounce is also physically demanding on the back and hamstrings and is a major cause of field umpire injuries. These two effects are compounding, with physical demands limiting the amount of time umpires can spend perfecting the craft. These reasons have resulted in opinions that all bounces should be replaced with throws. Long run-ups and front-on knee clashes during centre bounces became

6650-406: The knee joint. They are both isolated from the fluid-filled synovial cavity, with the synovial membrane wrapped around them. The PCL gets its name by attaching to the posterior portion of the tibia. The PCL, ACL , MCL , and LCL are the four main ligaments of the knee in primates. The PCL is located within the knee joint where it stabilizes the articulating bones, particularly the femur and

6745-424: The knees (a low tackle or a trip ) or above the shoulders (a high tackle ), the team with possession of the football gets a free kick. Furthermore, tackles deemed to be dangerous by the umpire and those conducted from front-on while an opposition player has their head over the football are deemed to be prohibited contact, and will incur a free kick against the offending player. Additionally, players may perform

6840-464: The markings on the ground: These restrictions apply only to the initial centre bounce, or a centre throw after a recalled centre bounce. An around-the-ground ball-up which happens to be at or near the centre of the ground is not subject to these restrictions. These markings were introduced over time to manage a variety of issues. The centre square (originally a centre diamond) was introduced in 1973 to prevent congestion from having too many rovers around

6935-568: The new national capital Canberra both soccer and rugby had a head start, but following the first matches in 1911, Australian rules football in the Australian Capital Territory became a major participation sport. By 1981 it had become much neglected and quickly lagged behind the other football codes. Australian rules football in the Northern Territory began shortly after the outbreak of the war in 1916 with

7030-445: The outstretched arms of the teams' ruckmen; ruckmen may also try to take clean possession of the ball, or allow it to fall to ground and become a ground contest. The ruck is one of the most specialised positions in an Australian rules football team, and is usually one of the tallest players or players with the highest vertical leap on the team. Under modern rules, in place since 2013, almost all ball-ups are executed by throw, with only

7125-461: The phasing out of many of the game's kicking styles and the increasing use of handball; while presentation was influenced by television. In 1982, in a move that heralded big changes within the sport, one of the original VFL clubs, South Melbourne, relocated to Sydney and became known as the Sydney Swans . In the late 1980s, due to the poor financial standing of many of the Victorian clubs, and

7220-407: The player has disposed of the ball, or "play on" is called, normal play resumes. Rucking is the only specialist skill and is performed by a ruck, the term for designated players from each side to which umpire sends the ball to commence play. Only a nominated ruck may contest ball-ups and throw-ins. They are the only player allowed within the 10 metre circle at a centre bounce. Functionally the role

7315-429: The player penalised for ' holding the ball ', except if the umpire deems there was a lack of prior opportunity to do so. The ball carrier may only be tackled between the shoulders and knees from the front or side. If the player forcefully contacts the opposing in the back while performing a tackle, the opposition player will be penalised for a push in the back . If the opposition tackles the player with possession below

7410-425: The players and confirmed by the umpires prior to throwing or bouncing the ball. There is no restriction on the positioning of other players around the contest, provided there is space for the umpire to execute the ball-up; this includes leaving a corridor immediately behind the umpire for him to retreat into. The two ruckmen must stand apart, and may not physically engage each other until the umpire has bounced or thrown

7505-415: The players, and flings the ball high and backwards over his head towards the ruck contest; the ball spins end-over-end. The same rules governing the ruck contest itself apply equally to a boundary throw-in as a ball-up. Boundary throw-ins were not always used in the sport's early history. Specialist boundary umpires were introduced in 1904, with the field umpire performing the restart before this. Originally

7600-436: The playing surface at any given time. Each team may have up to four interchange (reserve) players who may be swapped for those on the field at any time during the game. Although some leagues in less populated areas may use as few as 12 players. In addition, some leagues notably including the AFL, have each team designate one additional player as a substitute who can be used to make a single permanent exchange of players during

7695-668: The preeminent league in the country and would take a leading role in many aspects of the sport. The time around the federation of the Australian colonies in 1901 saw Australian rules undergo a revival in New South Wales, New Zealand and Queensland. In 1903, both the Queensland Australian Football League and the NSW Australian Football Association were established, and in New Zealand, as it moved towards becoming

7790-530: The premiers of the VFA and SAFA. Although clubs from other states were at times invited, the final was almost always between the premiers from the two strongest state competitions of the time—South Australia and Victoria—with Adelaide hosting most of the matches at the request of the SAFA/SANFL. The last match took place in 1976, with North Adelaide being the last non-Victorian winner in 1972. Between 1976 and 1987,

7885-408: The space above the tibia. These mechanisms occur in excessive external tibial rotation and during falls that induce a combination of extension and adduction of the tibia, which is referred to as varus-extension stress, or that occur while the knee is flexed. It is possible for the PCL to heal on its own. Even if the PCL does not heal normally, it is unusual for surgery to be required. Treatment

7980-467: The sport across Australia, delegates representing the football associations of South Australia, Tasmania, Victoria and Queensland met in 1883 and updated the code. New rules such as holding the ball led to a "golden era" of fast, long-kicking and high-marking football in the 1880s, a time which also saw players such as George Coulthard achieve superstardom, as well as the rise of professionalism , particularly in Victoria and Western Australia , where

8075-472: The sport experienced a period of dominance in the former, and in the latter, several regions remain strongholds of Australian rules, such as the Riverina . However, by the late 1880s, rugby football had become the dominant code in both colonies, as well as in New Zealand. This shift was largely due to rugby's spread with British migration, regional rivalries and the lack of strong local governing bodies. In

8170-406: The sport is most often called AFL after the Australian Football League , while the league itself also uses this name for local competitions in some areas. Primitive forms of football were played sporadically in the Australian colonies in the first half of the 19th century. Compared to cricket and horse racing , football was considered a mere "amusement" by colonists at the time, and while little

8265-414: The substantial TV revenues they generated by playing on a Sunday went to the VFL. To protect these revenues the VFL granted significant draft concessions and financial aid to keep the expansion clubs competitive. The VFL changed its name to the Australian Football League (AFL) for the 1990 season , and over the next decade, three non-Victorian clubs gained entry: Adelaide (1991), Fremantle (1995) and

8360-613: The supremacy of the Melbourne rules, the first-club level competition in Australia, the Caledonian Society's Challenge Cup (1861–64), stipulated that only the Melbourne rules were to be used. This law was reinforced by the Athletic Sports Committee (ASC), which ran a variation of the Challenge Cup in 1865–66. With input from other clubs, the rules underwent several minor revisions, establishing

8455-433: The umpires punched ball back into play; in 1910, this was changed to a short backwards throw-in, extended to a long backwards throw in 1920, and was replaced with a ball-up near the boundary line in 1921. The modern boundary throw-in was re-introduced in 1931 and has persisted since then. The laws governing a centre bounce (or centre throw) are more prescriptive, and lead to a different style of contest. Several rules consider

8550-412: The usage of other means, such as punching. While in possession of the ball, players may run with the ball, but are required to either bounce or touch the ball on the ground at least once every 15 metres (16 yd). Tackling is a technique employed by players used to force opposition players to dispose of the ball when they are in possession. Failure to dispose of the ball when legally tackled may see

8645-429: Was "almost solely influenced by his experience at Rugby School". A loosely organised Melbourne side, captained by Wills, played against other football enthusiasts in the winter and spring of 1858. The following year, on 14 May, the Melbourne Football Club was officially established, making it one of the world's oldest football clubs . Three days later, Wills, Hammersley, Thompson and teacher Thomas H. Smith met near

8740-556: Was a 20-per-side affair, played with a ball that was roughly spherical, and lasted until a team scored two goals. The shape of the playing field was not standardised; matches often took place in rough, tree-spotted public parks, most notably the Richmond Paddock ( Yarra Park ), known colloquially as the Melbourne Football Ground. Wills argued that the turf of cricket fields would benefit from being trampled upon by footballers in winter, and, as early as 1859, football

8835-485: Was allowed on the MCG. However, cricket authorities frequently prohibited football on their grounds until the 1870s, when they saw an opportunity to capitalise on the sport's growing popularity. Football gradually adapted to an oval-shaped field, and most grounds in Victoria expanded to accommodate the dual purpose—a situation that continues to this day. Football became organised in South Australia in 1860 with

8930-528: Was between Melbourne Grammar and St Kilda Grammar. On 10 July 1858, the Melbourne-based Bell's Life in Victoria and Sporting Chronicle published a letter by Tom Wills , captain of the Victoria cricket team , calling for the formation of a "foot-ball club" with a "code of laws" to keep cricketers fit during winter. Born in Australia, Wills played a nascent form of rugby football while

9025-435: Was coined by scholar Ian Turner in 1978 to describe the "fictitious geographical barrier" separating the rugby-following parts of New South Wales and Queensland from the rest of the country, where Australian football reigned. It became a reference point for the expansion of Australian football and for establishing a national league. The way the game was played had changed dramatically due to innovative coaching tactics, with

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