Total hip replacement with a trunnion bearing prosthesis. Biomechanical principles and preliminary clinical results.
The biomechanics are presented of a bushing principle forming the basis for a trunnion bearing prosthesis in total hip replacement. The femoral stem is equipped with a trunnion on to which a cylindrical plastic sleeve is applied. On top of this a metal casing is placed which forms the femoral head. On flexion-extension this remains stationary in the acetabular cup and motion occurs between the trunnion and the cylindrical sleeve. Friction between head and cup is reduced to a minimum, decreasing the risk of loosening. A follow-up study of 61 hips replaced by the trunnion bearing prosthesis was performed 2.5 years postoperatively. Eighty-eight per cent were considerably improved. There was one deep infection and two femoral stem loosenings.
D000077:Acetabulum; D000368:Aged; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D001172:Arthritis, Rheumatoid / Q000601:surgery; D001696:Biomechanical Phenomena; D002933:Cineradiography; D005260:Female; D005270:Femur Head / Q000503:physiopathology; D005500:Follow-Up Studies; D005684:Gait; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007595:Joint Prosthesis / Q000009:adverse effects; D008297:Male; D008875:Middle Aged; D009068:Movement; D010003:Osteoarthritis / Q000601:surgery; D010146:Pain; D011474:Prosthesis Design; D013167:Spondylitis, Ankylosing / Q000601:surgery; D013530:Surgical Wound Infection / Q000517:prevention & control
D000900:Anti-Bacterial Agents