1. In well selected cases of chronic arthritis of the polyarticular type about sixty per cent. of the cases are benefited by synovectomy, while in the monarticular type about seventy-five per cent. of the cases are improved by the operation.
2. Traumatic arthritis has a high percentage of good results (ninety-five per cent.) after synovectomy.
3. Tuberculous arthritis of the knee does not obtain relief from synovectomy.