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A specially designed apparatus delivered an anteriorly di rected step force to the posterior aspect of the leg while anterior tibial translation was monitored and electro myographic signals were recorded at the medial and lateral quadriceps, medial and lateral hamstrings, and gastrocnemius muscles. Testing was done at 30\u00b0 of knee flexion with the foot fixed to a scale to monitor weightbearing, while the tibia remained unconstrained. Results indicate that muscle timing and recruitment or der in response to anterior tibial translation are affected by anterior cruciate ligament injury. These alterations in muscle performance change with time from injury, cor relate with an individual's physical activity level, affect subjective functional parameters, and are directly re lated to the degree of dynamic anterior tibial laxity seen with stress testing.<\/jats:p>","DOI":"10.1177\/036354659402200116","type":"journal-article","created":{"date-parts":[[2007,6,21]],"date-time":"2007-06-21T20:46:52Z","timestamp":1182458812000},"page":"89-104","source":"Crossref","is-referenced-by-count":208,"title":["Neuromuscular Performance in Normal and Anterior Cruciate Ligament-Deficient Lower Extremities"],"prefix":"10.1177","volume":"22","author":[{"given":"Edward M.","family":"Wojtys","sequence":"first","affiliation":[{"name":"MedSport at the University of Michigan, Ann Arbor, Michigan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura J.","family":"Huston","sequence":"additional","affiliation":[{"name":"MedSport at the University of Michigan, Ann Arbor, Michigan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[1994,1,1]]},"reference":[{"key":"atypb1","unstructured":"Abbott LC, Saunders JB, Bost FC, et al Injuries to the ligaments of the knee joint J Bone Joint Surg 26: 503-521, 1944"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1651-2227.1959.tb17486.x"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1954.sp005047"},{"key":"atypb4","unstructured":"Andriacchi TP, Kramer GM, Landon GC The biomechanics of running and knee injuries, in Finerman G. 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