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Department of Orthopedic Surgery, Kaiser Hospital, and the Division of Orthopedic Surgery, UCSD, San Diego, California
Department of Orthopedic Surgery, Kaiser Hospital, and the Division of Orthopedic Surgery, UCSD, San Diego, California
Department of Orthopedic Surgery, Kaiser Hospital, and the Division of Orthopedic Surgery, UCSD, San Diego, California
Department of Orthopedic Surgery, Kaiser Hospital, and the Division of Orthopedic Surgery, UCSD, San Diego, California
Instrumented anterior/posterior laxity measurements were performed on 138 patients evaluated within 2 weeks of injury with their first traumatic knee hemar throsis. All patients were tested with the MEDmetric Arthrometer model KT-1000 in a knee injury clinic. Seventy-five of the patients had knee arthroscopy. Thirty-three had arthrometer laxity tests under anes thesia. Eighty-seven percent of patients arthroscoped had anterior cruciate ligament (ACL) tears and 41 % had meniscus tears.
One hundred twenty normal subjects were tested to establish normal anterior laxity values. Three tests were used to evaluate anterior laxity: anterior displacement between a 15 and 20 pound force (compliance index), anterior displacement with a 20 pound force, and an terior displacement with a high manually applied force. Displacement measurements in normal subjects re vealed a wide range of normal laxity with a small right knee-left knee difference. For example, the 20 pound anterior displacement range was 3 to 13.5 mm with a right knee-left knee difference (mean ± SD, 0.8 ± 0.7 mm). Eighty-eight percent of the normals had a right- left difference of less than 2 mm.
In the 53 patients arthroscoped who had complete ACL tears, the anterior laxity measurements performed in the clinic were suggestive or diagnostic of pathologic anterior laxity in 50 patients.
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