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KMID : 0386720020140020103
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Journal of the Korean Hip Society
2002 Volume.14 No. 2 p.103 ~ p.112
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Comparative Study between Hydroxyapatite Coated and Rough Blasted CLS Stem
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Kim Young-Ho
Park Ki-Chul
Min Kyoung-Bo
Choi Il-Yong
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Abstract
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Purpose: The purpose of this study was evaluate whether hydroxyapatite coatng demonstrated improved clinical and radiological results compared with no coating in patients who underwent total hip replacement using cementless Spotorno (CLS) femoral stem.
Materials and Methods: Two groups of 27 total hip arthroplasties with hydroxyapatite (HA) coated CLS stem and rough-blasted (RB) CLS stems, which were followed for more than 4 years, were selected with well matched patients varibles. Clinical and radiographic evaluations were performed according to Harris hip score (HHS) and radiographic parameters.
Results: Mean HHS at final follow-up was 96, improved froma preoperative score of 43, in the HA group, and 95, improved form 45.2 preoperatively, in the RB group. HHS was improved earlier in the HA group than in the RB group. Mean time at weight bearing without support was 6.4 weeks in the HA group and 8.4 weeks in the RB group, which was statistically different. In radiologic findings, endosteal bone formations around the femoral stem in each group were present in more than 80% of cases in zones 1, 2, 6, and 7, and from 40% to 70% of cases even in zones 3, 4, and 5. Radiolucencies around the femoral stem in each group were rarely seen in zones 1, 2, 6, and 7 but were obseved in 5 to 15% of cases in zones 3,4, and 5. A meausrable vertical subsidence of 2㎜ or more was not seen in the HA group but was observed in 3 of the RB cases (11.1%), although this was not statistically different.
Conclusion: Hydroxyapatite coated CLS stem was better than rough-blasted CLS stems, although only in terms of early improvement of clinical results and subsidence of the stem.
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KEYWORD
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Total hip replacement, HA coated CLS femoral stem, RB CLS femoral stem
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