Survival of uncemented acetabular monoblock cups: evaluation of 210 hips in the Swedish Hip Arthroplasty Register.

Acta Orthopaedica
Rüdiger J WeissJohan Kärrholm

Abstract

Monoblock acetabular cups represent a subtype of uncemented cups with the polyethylene liner molded into a metal shell, thus eliminating-or at least minimizing-potential backside wear. We hypothesized that the use of monoblock cups could reduce the incidence of osteolysis and aseptic loosening, and thus improve survival compared to modular designs. We identified all 210 primary total hip arthroplasty (THA) procedures in the Swedish Hip Arthroplasty Register that used uncemented monoblock cups during the period 1999-2010. Kaplan-Meier and Cox regression analyses with adjustment for age, sex, and other variables were used to calculate survival rates and adjusted hazard ratios (HRs) of the revision risk for any reason. 1,130 modular cups, inserted during the same time period, were used as a control group. There was a nearly equal sex distribution in both groups. Median age at the index operation was 47 years in the monoblock group and 56 years in the control group (p < 0.001). The cumulative 5-year survival with any revision as the endpoint was 95% (95% CI: 91-98) for monoblock cups and 97% (CI: 96-98) for modular cups (p = 0.6). The adjusted HR for revision of monoblock cups compared to modular cups was 2 (CI: 0.8-6; p = 0.1). Th...Continue Reading

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Citations

Aug 6, 2013·Clinical Orthopaedics and Related Research·Jelle J HalmaArthur de Gast
Jul 30, 2014·Clinical Orthopaedics and Related Research·William M MihalkoCarson Rider
Nov 7, 2019·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Eustathios KenanidisEleftherios Tsiridis
Mar 23, 2017·Australasian Physical & Engineering Sciences in Medicine·Talip ÇelikYasin Kişioğlu
Aug 25, 2018·International Orthopaedics·Francesco CastagniniLuca Busanelli

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Methods Mentioned

BETA
total hip arthroplasty

Software Mentioned

PASW

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