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KMID : 0386720040160010024
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Journal of the Korean Hip Society
2004 Volume.16 No. 1 p.24 ~ p.30
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Risk Factors for Dislocation after Primary Total Hip Arthroplasty
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Kim Young-Ho
Park Ki-Chul
Jung Jae-Hong
Choi Il-Yong
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Abstract
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Purpose: This study was undertaken to identify the factors that predispose to dislocation after primary total hip arthroplasty.
Materials and Methods: Of 482 total hip arthroplasties, 19 patients who had at least one dislocation were compared with a control group of nineteen patients without dislocation, matched for age, weight, gender, diagnosis and design of implant. Both the clinical parameters and mechanical parameters were evaluated.
Results: Dislocation after total hip arthroplasty had occurred in nineteen hips (3.9%). The mean age of patients in the dislocation group (57.1 years) was significantly higher than that in the non-dislocation group (50.1 years) (p<0.05). The mean anteversion of acetabulums in the dislocation group (19.8 degrees) was lower than that in the non-dislocation group (22.1 degrees) (p>0.05). There, were no statistically differences among the other mechanical parameters. The dislocation risk was 83 times higher in patients with high ASA scores (p>0.05), 3 times higher in patients with diminished motor function (p>0.05), and 6.4 times higher in patients who were operated within the first 5 years (p>0.05). However, the total combination of clinical and mechanical risk factors significantly affected dislocation after total hip arthroplasty (p<0.05).
Conclusion: A combination of multiple risk factors of clinical and mechanical parameters, rather than an isolated risk factor, significantly contributes to dislocation after primary total hip arthroplasty.
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KEYWORD
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Hip dislocation, Total hip arthroplasty, Risk factor
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