1. Synovectomy of the elbow affected by rheumatoid arthritis is a worthwhile procedure even in the presence of advanced radiological changes.

2. Relief of pain is good (93 per cent) and movement is retained (87 per cent).

3. Although the follow-up in this series was short, averaging nineteen months, the results seem to be maintained.

4. Good access to the joint may be had through medial and lateral incisions, and division of the olecranon is unnecessary. A lateral incision alone is not recommended.

5. The ulnar nerve should be preserved during dissection. Anterior transposition is needed only if there are neurological symptoms before operation.

1. In twenty-five patients with rheumatoid arthritis of the knee examined by contrast arthrography certain typical features were encountered. These consisted of enlargement of the suprapatellar pouch and loss of the normally smooth outline of the joint cavity because of nodular filling defects. In some cases less definite filling defects were seen, due to loose fibrinous deposits, particularly in popliteal cysts.

2. This method of assessment of the results of synovectomy of the knee correlated well with the clinical findings. The more satisfactory the clinical result the more normal the arthrograph. Patients who had recurrence of pain, swelling and tenderness in the knee showed arthrographic findings similar to those before operation.