A LARGE COLLAR INCREASES NECK RESORPTION IN TOTAL HIP-REPLACEMENT - 204 HIPS EVALUATED DURING 5 YEARS

We evaluated the effect of a prosthetic collar on the proximal femoral bone in 204 hips without any signs of loosening after 5 years. The pa tients were operated on at 5 centers, using different prosthetic desig ns, but the same cementing technique. Resorption was more often found in cases with a true and large collar (Lubinus, HD2, Scanhip) than in cases with a flanged or tapered stem (Charnley, Exeter). The resorptio n was also more pronounced with the former designs. It was concluded t hat, in spite of theoretical advantages, a large collar is not only un necessary but may also have negative longterm effects.