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FiguresFigure 1 Figure 2 Figure 3 Figure 4Poster: 2The Use of Constrained Cementless Acetabular Component for Instabilityin Total Hip ReplacementBackground:*Mohammed Kamal Asal - ? - ?, ?*Email: aymanbassiony@yahoo.comRecurrent dislocation after total hip arthroplasty is a disabling complication that can be difficultto treat. The purpose of the present study was to evaluate the early clinical and radiographicoutcome associated with the use of a constrained acetabular component for instability in totalhip arthroplastyPatients and Methods:Fifteen patients underwent either primary or revision total hip arthroplasty with cementlessconstrained acetabular component for different indications. The mean patient age at surgery was57.4 years and the mean clinical and radiological follow-up period was 26.4 months. Clinicalassessment was performed by the Harris hip score and at the latest follow up patients reportedoutcome using the Oxford hip score questionnaire. All radiographs were evaluated for evidenceof loosening.Results:No dislocations were noticed in 14 out of 15 cases. Only one case had redislocations with theconstrained prosthesis. The average Harris hip score increased from a preoperative mean of 22(range, 16 - 36) to a postoperative mean of 85 (range, 66-94). Preoperatively, the Oxford HipScore had a mean score of 48.6 and decreased to 20.5 at the final examination. All but one ofthe 15 hips had a well-fixed, stable cup. Femoral components stability was classified as stablebone ingrowth in all cases.Conclusion:Constrained acetabular component is a highly effective option for the treatment of hip instabilityin primary and revision arthroplasty in those at high risk of dislocation. The aseptic looseningrate is a major concern and has to be evaluated with long term studies.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]