1. Lateral radiographs of fifty-seven club feet and seventeen normal feet were taken in forced flexion and forced extension. On these, the arcs traversed by the talus, the sole and the calcaneus were measured, as was the talo-calcaneal angle.

2. It was found that the ankle in club feet usually contributed more than half of the total sagittal movement of the foot.

3. Occasional cases were encountered in which the ankle was so damaged that it contributed only half or less than half of this movement. In such cases wedge excision of the ankle joint is theoretically justified in preference to wedge tarsectomy.

4. The talo-calcaneal angle is much reduced in club foot, and this element of deformity is extremely resistant to manipulative treatment. The reasons for this and a possible method of treatment are discussed.

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.