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Ankle sprains are one of the most common musculoskeletal injuries and are especially relevant at all level of sport.1 Of all sports, the incidence of ankle sprain is higher in volleyball considering its non-contact nature.2 The most common ankle sprain occurs on the lateral or outside part of the ankle.3 Reports estimate that ankle sprains account for approximately 24% to 54% of all sport-related injuries and 23,000 persons get them per day in the United States.4

Lateral ankle sprain occurs when the ligaments that support the ankle get overly stretched or either partially or completely torn.1 This can occur when the foot twists inwards (foot is adducted in planter flexion).5 The ligaments involved with lateral ankle sprains are the Anterior Talofibular Ligament (ATF), Calcaneofibular Ligament (CF), and Posterior Talofibular Ligament (PTF).6 The Anterior Talofibular Ligament is the weakest and most commonly injured ligament in the ankle.6 The posterior Talofibular Ligament is rarely torn in the ankle sprain.6 Anterior Drawer Test can be used to assess the strength of the Anterior Talofibular Ligament and Inversion Stress Test can be used to evaluate the Calcaneofibular Ligament.6

Ankle sprains are divided into three grades ranging from mild to severe.6 A grade I sprain is defined as mild sprain with stretching and possible mild tearing of the ligaments without instability of the affected joint. There is swelling and mild stiffness around the joint but people can walk with minimal pain.6 A grade II sprain is defined as moderate sprain with partial tearing of the ligaments. Abnormal looseness of the ankle joint occurs when the ankle joint is moved in certain ways and ligaments will be tender when touched. People can walk with diff...

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19. Binkley JM, Stratford PW, Lott SA, Riddle DL. The Lower Extremity Functional Scale (LEFS): scale development, measurement properties, and clinical application. North American Orthopaedic Rehabilitation Research Network. Phys Ther. 1999;79:371-383.
20. Watson CJ, Propps M, Ratner J, Zeigler DL, Horton P, Smith SS. Reliability and responsiveness of the lower extremity functional scale and the anterior knee pain scale in patients with anterior knee pain. J Orthop Sports Phys Ther. 2005;35:136-146. http://dx.doi.org/10.2519/jospt.2005.1403
21. Alcock GK, Stratford PW. Validation of the Lower Extremity Functional Scale on athletic subjects with ankle sprains. Physiother Can. 2002;54:233-240.
22. Bohannon RW. Intertester reliability of hand-held dynamometry: a concise summary of published research. Percept Mot Skills. 1999;88(3 part1):899–902.

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