The ACL is one of main structures which has a stabilizing function of the knee. Unfortunately a large percentage of complete anterior cruciate ligament ruptures is diagnosed long after the injury. In search for solution to challenge of reconstruction of anterior cruciate deficient knee, autogenous tissue graft and synthetic graft as total prostheses have been tried. The late Dr. John. C. Kennedy developed the concept of augmentation which have compensated the drawbacks of those. we examined individuals after ACL reconstruction using patella tendon with Kennedy-LAD and analyzed changes in stability, function, sports activities and isokinetic Quadriceps/Hamstring muscle strength by Robert W. Sydner's subjective and objective criteria and Cybex II dynamometer. From December 1986 to March 1990, we operated the 21 males and 4 females. In this study, 15 males and 4 females participated. The average follow up period was 29 months with maximum 47 months and minimum 17 months. A satisfactory outcome found in 16 cases out of 19 cases followed up more than 12 months.