1. Arthrodesis is one method to be considered in treating cases of non-union of the hip. It should also be considered in cases of painful necrosis of tile head following Union.
2. It should be the method of choice, if it can be determined that there are contraindications to other operative procedures.
3. It is the last resort when other operations have failed.
4. In the writer's experience, bony ankylosis has occurred in only 60 per cent. of the patients operated upon, but the remaining 40 per cent. have had stable and useful hips, and have not complained of pain.
5. Ankylosis of tile hip, with the extremity in proper position for weight-bearing and locomotion, enables the patient to resume an active life, and the absence of motion constitutes a comparatively slight disability.