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ACL INJURY - Paul Semenets Anatomy The anterior crusade ligament ACL is one of four ligaments that help stabilize the knee The ligament is located in the center of the knee and is a strong band of tissue that prevents the tibia from extending excessively beyond the femur It looks like a think cord about the width of an index finger and stretches from the back of the thigh to the front of the shin bone See Appendix 1 It has four main functions as a stabilizer to restrain the anterior translation of the tibia prevent hyperextension of the knee control of the tibia on the femur and act as a secondary stabilizer reinforcing the medial collateral ligament Thus the ACL is a very important ligament that allows humans to walk and perform activities that involve the knee joint the most vital joint of the body Causes The majority of ACL injuries suffered during athletic participation are the non-contact variety The injury may result from violent twisting motion of the knee whether it is during a planting and cutting straight-knee landing or one-step landing with the knee hyperextend Sudden deceleration and pivoting are also common methods of injuring the ACL ligament Several injuries may also occur due to playing surfaces and weather conditions that may affect the players balance and range of motion Some ways of non-contact ACL injuries occurrences including stopping quickly cutting sharply and landing and changing direction with both feet planted Some sports activities include soccer basketball volleyball skiing and football A tear of an anterior crusade ligament can be serious injury that can affect an athletes performance or a persons ability to walk Diagnosis Patients with ACL tears usually describe a twisting or hyperextension of the knee At the time of the injury patients may describe a pop that they heard which is actually the tear of the ligament See Appendix 2 Initially the symptoms are
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