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Satisfactory mid-term results seen after cementless THA for developmental dysplasia of the hip
Although investigators found satisfactory mid-term results for patients who underwent cementless total hip arthroplasty for treatment of Crowe IV-Hartofilakidis type III developmental dysplasia of the hip, major complications included polyethylene wear and intraoperative fractures.
Researchers evaluated outcomes for 58 patients who underwent a total of 249 cementless total hip arthroplasties performed with Zweymller implants (Smith & Nephew) for the treatment of Crowe IV-Hartofilakidis type III developmental dysplasia of the hip. The mean patient age was 35.8 years. Investigators recorded the Harris Hip score and obtained radiographs at 6 weeks, 3 months, and 6 months postoperatively. Average follow-up was 70.5 months.
Investigators also measured cup inclination, leg length, bone union and loosening. For analysis of survivorship, investigators used the Kaplan-Meier method. The association between influencing factors and polyethylene wear was determined with both univariate and multivariate linear regression analyses.
Findings showed the mean Harris Hip score increased from 35.6 preoperatively to 82.9 postoperatively. Intraoperative fractures were found in 20 patients, with one in the acetabulum, 15 in the proximal femur and four in the distal femur. Investigators noted at 98 months, the Kaplan-Meier survivorship was 91.4%. Of the seven patients who were revised, four were due to severe polyethylene wear. According to multivariate analysis results, cup inclination and head size were significant factors for wear. ‒ by Monica Jaramillo
Disclosure: The researchers report no relevant financial disclosures.