[Results of surgical treatment of patellar disequilibrium. Apropos of 311 cases].

Three hundred eleven operations for patellar instability were reviewed after 2 to 10 years. Best results were obtained with surgical procedures on the quadriceps, especially with plasty of the vastus medialis and occasional transposition of the tibial tuberosity. If the procedure was limited to the patellar cartilage or the tibial tuberosity only, the results were not as good. Good results were achieved in 84 per cent of 269 patients: 14 per cent were satisfactory and 2 per cent were failures.