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The purpose of this study was to develop a test battery of lower extremity strength tests with high ability to discriminate between leg power development on the injured and uninjured sides in patients after ACL injury and in patients who have undergone ACL reconstruction. Twenty\u2010three patients were tested 6\u00a0months after ACL injury and 44 patients were tested 6\u00a0months after ACL reconstruction. Twenty\u2010four of the 44 patients were operated on using a hamstrings graft and 20 patients were operated on using a patellar tendon graft. All the patients performed a test battery of three strength tests for each leg in a randomised order. The three strength tests were chosen to reflect quadriceps and hamstring muscular power in a knee\u2010extension and a knee\u2010flexion test (open kinetic chain) and lower\u2010extremity muscular power in a leg\u2010press test (closed kinetic chain). There was a higher sensitivity for the test battery to discriminate abnormal leg power compared with any of the three strength tests individually. Nine out of ten patients after ACL reconstruction and six out of ten of the patients after ACL injury exhibited abnormal leg power symmetry using the test battery. Thus, this test battery had high ability in terms of discriminating between the leg power performance on the injured and uninjured side, both in patients with an ACL injury and in patients who have undergone ACL reconstruction. It is concluded that a test battery consisting of a knee\u2010extension, knee\u2010flexion and leg\u2010press muscle power test had high ability to determine deficits in leg power 6\u00a0months after ACL injury and reconstruction. Only a minority of the patients had restored leg muscle power. The clinical relevance is that the test battery may contribute to the decision\u2010making process when deciding whether and when patients can safely return to strenuous physical activities after an ACL injury or reconstruction.<\/jats:p>","DOI":"10.1007\/s00167-006-0040-y","type":"journal-article","created":{"date-parts":[[2006,2,13]],"date-time":"2006-02-13T13:34:02Z","timestamp":1139837642000},"page":"571-580","source":"Crossref","is-referenced-by-count":108,"title":["Development of a strength test battery for evaluating leg muscle power after anterior cruciate ligament injury and reconstruction"],"prefix":"10.1002","volume":"14","author":[{"given":"Camille","family":"Neeter","sequence":"first","affiliation":[{"name":"Lundberg Laboratory for Orthopaedic Research Department of Orthopaedics Sahlgrenska University Hospital G\u00f6teborg University 413 45 G\u00f6teborg Sweden"},{"name":"Sportrehab\u2013Physical Therapy and Sports Medicine Clinic G\u00f6teborg 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