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KMID : 0386720040160040423
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Journal of the Korean Hip Society
2004 Volume.16 No. 4 p.423 ~ p.427
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Osteolysis around Cementless Acetabular Component
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Park Sang-Won
Baek Jong-Ryoon
Lee Sang-Won
Lee Dae-Hee
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Abstract
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Purpose: The purpose of this study was to evaluate the factors that have an influence on the osteolysis of cementless acetabular components (Harris-Galante type 2).
Material and Method: From 1991 to 1994, 36 patients (44 cases) of total hip arthroplasty using a Multilock femoral stem and a Harris-Galante type 2 acetabular cup were reviewed with minimal follow-up period of 10 years.
The relationship between the osteolysis and several factors such as the age, gender, weight, etiology, inclination, polyethylene liner thickness and wear rate were analyzed.
Results: Osteolysis around the acetabular cup was found in 18 cases (40.9%). The most common area where this developed was zone 2 (16 cases, 36.4%). There was no statistically significant relationship between the age, gender, weight, etiology, inclination angle and the osteolysis. However, there was statistically significant correlation between the polyethylene liner thickness, wear rate and osteolysis. The average polyethylene liner thickness was 7.1 mm in
cases with osteolysis and 8.1 mm in cases without osteolysis. The average wear rate was 0.26 mm/year in the osteolysis group, and 0.14 mm/year in the non-osteolysis group.
Conclusion: The incidence of osteolysis in the cementless acetabular component (Harris-Galante type 2) may increase as the follow-up period increases, and it was significantly related to the thickness and wear rate of the polyethylene liner. We suggest that the acetabular component needs an improved locking mechanism, improvement for the polyethylene liner longevity, and a ceramic or metal bearing surface is needed.
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KEYWORD
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Cementless Acetabular Component (Harris-Galante 2), Osteolysis
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