J Korean Orthop Assoc.  2003 Sep;38(5):472-477.

Five Year Results of Hydroxyapatite Coated Hip System: Early Severe Wear and Acetabular Osteolysis

Affiliations
  • 1Department of Orthopaedic Surgery, Maryknoll Hospital, Busan, Korea.
  • 2Department of Orthopaedic Surgery, Gwangju Christian Hospital, Gwangju, Korea.
  • 3Department of Orthopaedic Surgery, Pusan National University, Busan, Korea. kuentak@pusan.ac.kr

Abstract

PURPOSE
To assess the midterm results of the hydroxyapatite hip system with acetabular cups, with particular emphasis upon cup wear and loosening, using a computer assisted-3 dimensional technique. MATERIALS AND METHODS: From March 1992 to December 1996, 52 patients (61 hips) were available for inclusion in this study after an average duration of follow up of 6 years and 4 months. Clinical evaluation was performed using the Harris hip scoring system. Initial postoperative and long term follow up films were digitized, and 2 dimensional linear and 3 dimensional wear was measured by using a computer assisted-3 dimensional technique. Acetabular bone changes are described using previous published methods. RESULTS: An analysis of the clinical results showed a mean Harris hip score of 47.2 points preoperatively and 89.8 points at the final visit. The mean polyethylene 3D-linear wear rate was 0.26 mm/year and mean volumetric wear rate was 105.9 mm3/year. In 16 hips (26.2%) the linear wear rate was more than 0.3 mm/year (0.30-0.74 mm/year). Osteolytic changes of the acetabulum were recorded in 51% around acetabular cups, in which considerable wear of the acetabular polyethylene was evident by the five-year radiographic findings. CONCLUSION: Midterm results of hydroxyapatite coated acetabular cups were disappointing in terms of acetabular cup and liner wear, despite early accelerated bone remodeling by hydroxyapatite and excellent early clinical results.

Keyword

Total hip arthroplasty; Hydroxyapatite

MeSH Terms

Acetabulum*
Arthroplasty, Replacement, Hip
Bone Remodeling
Durapatite*
Follow-Up Studies
Hip*
Humans
Osteolysis*
Polyethylene
Durapatite
Polyethylene
Full Text Links
  • JKOA
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
Copyright © 2024 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr