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KMID : 0386720030150030193
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Journal of the Korean Hip Society
2003 Volume.15 No. 3 p.193 ~ p.199
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Total Hip Arthroplasty with Hydroxyapatite-Coated Smooth-Surfaced Hemispherical Acetabular Component
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Hwang Sung-Kwan
Kim Wan-Ki
Kim Hong-Kyum
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Abstract
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Purpose: To evaluate the early-mid term results of a total hip arthroplasty using a hydroxyapatite (HA)-coated smooth-surfaced hemispherical acetabular component.
Materials and Methods: Of fifty-four total hip arthroplasty, using a HA-coated, smooth-surfaced, hemispherical cup, performed between March 1992 and April 1995, forty-three (39patients) were available for this study. For these 40 hips the mean follow-up period and age at the index operation were 87 months and 45 years, respectively. The clinical results were evaluated using Harris hip score, and the radiological results were evaluated in terms of stability, polyethylene wear rate and osteolysis around the acetabular component.
Result: The mean preoperative Harris hip score of 54.2 points improved to 92.7 points 1 year after surgery, but decreased to 82.4 points at the last follow-up. The mean polyethylene wear rate was 0.25 mm/year, with pelvic osteolysis occurring in 8 hips (18.6%). Two acetabular components (4.7%) were unstable on the radiograms at the last follow-up. Six acetabular components (14.0%) were revised due to pelvic osteolysis and cup migration. The mean time between the index operation and the revision was 102.3 months.
Conclusion: The clinical results of a total hip arthroplasty using a HA-coated, smooth-surfaced, hemispherical acetabular component were satisfactory. However, a high rate of pelvic osteolysis due to polyethylene war was observed, resulting in a high revision rate.
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KEYWORD
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Total hip arthroplasty, Hydroxyapatite, Smoothsurface, Hemispherical acetabular component.
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