Abstract
We report a thirty year-old man who presented with a locked knee caused by both type D medial plica and partial tear of the anterior cruciate ligament. He experienced pain in the left lateral side of his femoro-tibial joint and his range of motion was limited from -10 degree to 130 degree. Preoperative diagnosis was a lateral meniscus tear. Arthroscopic examination revealed that the torn type D plica had impinged on the medial femoral condyle and the knee was flexed by the partial tear of the ACL which had impinged on the intercondylar space there by blocking full extension. After arthroscopic resection of both lesions, the patient's symptoms diminished. The diagnostic difficulty of such a patient with a locked knee not caused by a meniscal injury are discussed.
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