Abstract
1. A study has been made of the treatment of recurrent dislocation of the patella in 106 knees in seventy-six patients.
2. In young adults in whom degenerative changes in the knee were not severe at the time of operation transplant of the tibial tubercle gave the best results.
3. In older patients and in those in whom osteoarthritic changes were present in the knee transplant of the tibial tubercle was unsatisfactory, but patellectomy with rerouting of the quadriceps mechanism gave fair results.
4. Tibial tubercle transplant is contra-indicated in children because it may give a recurvatum deformity.
5. When the dislocation is permanent, operation may be unnecessary, but if it becomes inevitable simple patellectomy is the best procedure.
6. The results of plastic operations on the quadriceps expansion and of supracondylar femoral osteotomy are bad.
7. No operation can give consistently good results because the knee is usually congenitally weak, often as part of generalised ligamentous laxity.
