Five Year Results of Hydroxyapatite Coated Hip System: Early Severe Wear and Acetabular Osteolysis.
10.4055/jkoa.2003.38.5.472
- Author:
Hyung Taek PARK
1
;
Yun Seok KIM
;
Young Ryool CHUNG
;
Kuen Tak SUH
Author Information
1. Department of Orthopaedic Surgery, Maryknoll Hospital, Busan, Korea.
- Publication Type:Original Article
- Keywords:
Total hip arthroplasty;
Hydroxyapatite
- MeSH:
Acetabulum*;
Arthroplasty, Replacement, Hip;
Bone Remodeling;
Durapatite*;
Follow-Up Studies;
Hip*;
Humans;
Osteolysis*;
Polyethylene
- From:The Journal of the Korean Orthopaedic Association
2003;38(5):472-477
- CountryRepublic of Korea
- Language:Korean
-
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.
