1. Herniations through defects in the mid-portion of the iliac crest may occur and may be extremely disabling. 2. Removal of bone from the iliac crest for grafting purposes should always include the complete crest from the anterior superior spine region backward and should not leave an opening in the mid-portion of the crest. 3. Repair of such herniations, even when quite extensive, has been successfully accomplished in three cases by the procedure given.