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Anterior Cruciate Ligament ( Acl ) Injury

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INTRODUCTION
Anterior cruciate ligament (ACL) injury is a common sports injury occurs widely in the USA with the majority of suffering by healthy individuals with 70% of non contact period, during a variety of movements such as jump landing, cutting and pivoting (21). Different risk factors should be considered for injury, such as environmental, hormonal and biomechanical (18, 19). ACL injury prevalence is very high in soccer as well as other sports in females compared with males (29). Anterior shear force, valgus collapse, quadriceps to hamstring strength ratio (1, 21, 35, 37) are considered as other main risk factors in both genders. Co-contraction of the hamstring and quadriceps has been shown to provide dynamic stability to the frontal plane at the knee that protects maximum knee abduction loading (35). So, the main focus of the study should be on muscular strength between agonist –antagonist muscle of lower limbs and recovery after injury. Female athletes get injured almost 2-8 time higher than the male counterparts (1,5,7,19,21,24,29,33,35). Interesting point for comparing injuries in sports, dominancy of leg plays a role in ACL injury. In a non contact injury, females are more prone to get injured in their supporting leg, whereas male soccer athletes tend to injure the ACL in their preferred kicking leg (5). Biomechanical point of view, such as more extended hip-knee landing technique postures, knee pressure

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