Fifty-three cases of chronic lesion of the anterior cruciate ligament were followed up clinically and radiographically, and treated consecutively with an artificial Dacron Stryker ligament. An average of 29 months (range 12-53) after surgery, the authors report a high incidence of residual laxity (70.5%) and a 13% incidence of complications. There were no cases of evident synovitis, even if the authors do report a high percentage (85%) of periligamentous femoral osteolysis. Based on the results obtained, the authors believe that the Dacron Stryker ligamentous prosthesis is only indicated in cases where a biological ligament fails in patients engaged in competitive sports who request immediate activity for a limited period of time.