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35 patients with ACL deficient knee underwent ACL reconstruction with the Leeds Keio prosthetic ligament. Patients ranged in aged from 22 to 34 years, 57.1 percent has associated meniscal injuries and the average injury reconstruction interval was 2.1 years. All patients had open, combined intra and extra articular reconstruction. Followup ranged from 10 months to 4 years. Good results were seen in 29, fair results in 3 and poor in 3. Poor results were due to rerupture (2 cases) and patellofemoral arthritis (1) A relook arthroscopy of a knee with ruptured ligament, confirmed collagen ingrowth.