CEMENTLESS HEMISPHERIC ACETABULAR COMPONENTS - 2-4-YEAR RESULTS

A retrospective clinical and radiographic analysis was performed on 99 patients (106 hips) undergoing total hip arthroplasty with noncemente d Harris-Galante (Zimmer, Warsaw, IN) or Optifix (Smith Nephew Richard s, Memphis, TN) acetabular components. There were 94 primary and 12 re vision procedures with a minimum follow-up period of 24 months (range, 24- 52 months). The cups were evaluated for evidence of vertical and horizontal migration, as well as the presence of radiolucencies at the bone-implant interface. Age, sex, component inclination and medializa tion, cup coverage, and number of fixation screws used were examined t o determine the influence of these factors on the incidence of cup mig ration or radiolucent line formation. A radiolucent line was present i n at least one zone in 60% of the Harris-Galante and 45% of the Optifi x cups. Progressive radiolucent lines were noted in two of the Optifix and three of the Harris-Galante components. Two Harris-Galante cups ( 1.9%) were revised. There were no Optifix cup migrations or evidence o f instability in the Optifix or remaining Harris-Galante cups. Althoug h there was a trend toward an increased incidence of radiolucencies in those cups lacking complete coverage, no statistically significant ra diographic predictors for failure or impending failure could be determ ined from this short-term follow-up study. With the exception of the t wo revisions, all acetabular components performed well clinically over the study period.