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Department of Surgery, Letterman Army Institute of Research, Presidio of San Francisco, California
Department of Surgery, Letterman Army Institute of Research, Presidio of San Francisco, California
Department of Surgery, Letterman Army Institute of Research, Presidio of San Francisco, California
Ten dogs and six rhesus monkeys underwent transection and repair of the anterior cruciate ligament. One-half of the pro cedures involved the femoral end, the other half involved the tibial end of the ligament. Seven of the 10 canine and all of the primate ligaments, that had been transected and repaired, did heal. Functional and clinical instability was demonstrable in all repaired knees. The monkeys developed fewer degenerative changes with more grossly normal appearing ligaments after the repairs than did the dogs. Failure testing on an Instron materials testing machine revealed maximum strength of the repaired ligaments to be 10.4% for the repairs at the femoral end and 2.0% for repairs at the tibial ends in dogs when compared with the contralateral control knees. In monkeys the femoral repairs were 46.8% and the tibial repairs were 62.6% of the control knees. Inadequate immobilization and early stress were believed to be principal causes of the poorer results in dogs. The observations in monkeys support the suggestion that injured anterior cruciate ligaments that can be repaired, should be repaired.
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