1. Semitendinosus tenodesis with adequate lateral release for recurrent dislocation of the patella has a high success rate and a low complication rate.

2. The technique of operation is simple.

3. Its particular application is in the young patient before epiphysial closure, although it can give good results in the older patient.

1. Twenty patients with congenital short tendo calcaneus are described.

2. All were treated by tendon lengthening and followed up for one and a half to seven years.

1. The operation of spinal fusion combined with Harrington rod instrumentation is often accompanied by severe blood loss. Factors affecting the degree of blood loss are discussed with emphasis on the adverse effects of partial or complete obstruction of the inferior vena cava during operation.

2. A new scoliosis operating frame is described which is designed to encourage normal venous return during spinal fusion with the patient prone. In addition, it stabilises the patient during the procedure.

3. A standard anaesthetic technique and method of supporting the patient have been used in forty major corrective operations in thirty-eight consecutive cases of scoliosis in the past nine months. The measured blood loss at operation encountered in this series compares favourably with the quantities lost in a previously reported series of cases in which alternative methods of anaesthesia and of support for the patients were used.

4. All operations in both series were performed by the same surgeon (J. E. H.). Although further experience with the surgical technique has helped in reducing the blood loss in the later series, the same basic method of exposure and performance of the instrumentation and fusion has been used in all cases.

1. One hundred and seventy-three hips in 138 patients have been examined and studied in reference to the type of treatment received.

2. Shepherd's method of assessing the results of arthroplasty operations has been adapted to this series.

3. Satisfactory results were found in 77·9 per cent of all patients.

4. The value of straight longitudinal traction is questioned. Medial rotation appears to be an essential step in the reduction of the deformity.

5. Manipulation was found to be a relatively safe and effective method of reducing the deformity in patients seen soon after an acute episode, and should be reserved for them.

6. Complications were common after nailing operations, and included subtrochanteric fracture in three cases.

7. Avascular necrosis was the commonest cause of a poor result. The two types of avascular necrosis are discussed.

8. Avascular necrosis was found in 37 per cent of cases in which a manipulation was followed by a nailing operation.

9. Avascular necrosis was not found in any case in which a manipulation was combined with the use of Moore's pins, but such cases were kept under observation for a shorter time.

10. Avascular necrosis was found in 38·1 per cent of cases of cervical osteotomy.