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Journal of Bone and Joint Surgery - British Volume, Vol 84-B, Issue 6, 839-845.
doi: 10.1302/0301-620X.84B6.12492  
Copyright © 2002 by British Editorial Society of Bone and Joint Surgery
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The performance of two hydroxyapatite-coated acetabular cups compared with Charnley cups

FROM THE NORWEGIAN ARTHROPLASTY REGISTER

L. I. Havelin, MD, PhD, Consultant Orthopaedic Surgeon; B. Espehaug, MSc, PhD, Statistician; and L. B. Engesæter, MD, PhD, Professor, Consultant Orthopaedic Surgeon

Department of Orthopaedic Surgery, Haukeland University Hospital, N-5021 Bergen, Norway.

Correspondence should be sent to Dr L. I. Havelin.

We have compared the survival of two hydroxyapatite (HA)-coated cups, 1208 Atoll hemispheric and 2641 Tropic threaded, with cemented Charnley all-polyethylene cups (16 021) using the Cox regression model.

The Tropic cup used in combination with an alumina ceramic femoral head, had good results, similar to those of the Charnley cup. When used in combination with a stainless-steel head, however, the risk of revision beyond four years was increased 3.4 times for the Tropic cup compared with the Charnley cup (p < 0.001). Over the same period, the Atoll cup had an increased risk of revision of 3.8 times when used with the alumina heads (p < 0.001) and an increased risk of 6.1 times when used with stainless-steel heads (p < 0.001). Revision because of wear and osteolysis was more common with both types of HA-coated cup than with the Charnley cup. The rate of revision of the Atoll cup because of aseptic loosening was also increased.

We found that HA-coated cups did not perform better than the Charnley cup.




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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General