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Analysis of Failure Cause of Acetabular Components Among Total Hip Replacement Arthroplasties Using RB Wagner Acetabular Cup  

Kim, Young-Chang (Department of Orthopaedic Surgery, College of Medicine, Inje University, Haeundae Paik Hospital)
Kim, Young-Bok (Department of Orthopaedic Surgery, College of Medicine, Inje University, Haeundae Paik Hospital)
Park, Dae-Hyun (Department of Orthopaedic Surgery, College of Medicine, Inje University, Busan Paik Hospital)
Moon, Sang-Won (Department of Orthopaedic Surgery, College of Medicine, Inje University, Busan Paik Hospital)
Publication Information
Hip & pelvis / v.22, no.2, 2010 , pp. 143-150 More about this Journal
Abstract
Purpose: The purpose of this study was to analyze the cause of failure of acetabular component cases after metal-onmetal primary total hip arthroplasty using RB Wagner acetabular cup. Materials and Methods: Between January 1993 and January 2005, we retrospectively studied failure cause of 27patients who underwent acetabular revision surgery among 468 consecutive cementless total hip arthroplasties using RB Wagner acetabular component. The duration of primary arthroplasty to revision ranged from 5.1 years to 11.5 years (mean 9.2 years). The clinical evaluation was performed using preoperative and last follow-up modified Harris hip scores. The radiological evaluation was performed in terms of the stability, such as inclination, anteversion, cup size, acetabular bone coverage, osteolysis, radiolucency and gap. Results: The average Harris hip scores was 49.6 preoperatively and 91.3 at the most recent follow-up. In revision cases, the score was 41.2 to 51.7. Among 468 cases, 27 patients underwent revision surgery (7%, 27/468) and there was no osseointegration in all cases. The radiological evaluation in revision cases revealed inclination ($46.04{\pm}5.328$, p=0.0031), anteversion ($14.14{\pm}2.95$, p=0.584), cup size ($54mm{\pm}2.5$, p=0.042) and acetabular bone coverage ($67.9%{\pm}4.77$, p=0.003). Focusing on the relation between disease entities, there was relatively high risk in patients with hip dysplasia (Fisher's exact test, p=0.0095). Conclusion: Although Wagner acetabular cup relatively showed as high survival rate as 93%, failure rate is significantly high in dysplastic hip patients.
Keywords
Dysplastic hip; Total hip arthroplasty; RB Wagner acetabular cup;
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