The anterior cruciate ligament (ACL) is the most frequently injured ligament in the knee joint. Various graft substitutes have been used for reconstruction of the ACL. The aim of our study was to evaluate the efficacy of the hamstring tendons in restoring the anterior knee stability and the ability to reproduce the function of the normal ACL, with an estimate of the percentage of associated morbidity. Fifty-nine patients underwent arthroscopic ACL reconstruction using the semitendinosus and gracilis tendons. Forty-four patients were performed at the Cleveland Clinic Foundation and 15 were done in Cairo, with a follow up of 6 months to one year. An accelerated program was used for the postoperative rehabilitation. All patients were evaluated using the IKDC knee rating system and 31 patients underwent isokinetic testing for the strength of the hamstrings and quadriceps muscles. 90.6% of the patients had a final rating of normal or nearly normal using the IKDC system. Post harvest of the hamstring tendons the knee recovered near full flexion strength. The incidence of postoperative complications as harvest site morbidity, anterior knee pain and quadriceps atrophy were significantly lower than that developed with ACL reconstructions using the patellar tendon recorded in the literature.In conclusion, this investigation showed that the arthroscopically assisted hamstrings reconstruction for subacute and chronic ACL ruptures produces safe and reproducible results, with a low incidence of complications.