Convened under the auspicious of esteemed endorsers - ISTA

Vassilios Nikolaou - . - ., .*Email: waddellj@smh.caPurpose:To review prospectively collected data on patients undergoing primary total hip arthroplastyutilizing two different cementless acetabular components.Materials & Methods:All patients undergoing primary total hip replacement surgery at our institution are enteredprospectively into a database which includes history and physical examination, radiology,WOMAC and SF-36 scores. The patients are re-examined, re-x-rayed and re-scored at 3months, 6 months and 1 year after surgery and yearly thereafter.Using this database we are able to identify patients who have undergone total hip replacementusing one of two geometric variants of the acetabular component. The first design ishemispherical and the second design has a peripheral rim expansion designed to increase initialpress-fit stability.Results:Five hundred and twenty-seven consecutive primary total hip replacements were identifiedusing either of the geometric variants of the acetabular component. Results at a mean of 7 yearsrevealed a 95.6% survivorship with no significant difference between the two componentdesigns with revision for aseptic loosening as the end point. Functional scores between the twogroups of patients also demonstrated no statistically significant difference.Radiologic assessment, however, showed a difference between the two designs. Thehemispherical design which matches the reamer line-to-line had 80% complete osseointegrationon final radiologic review while the second design with a peripheral rim expansion had only57% complete osseointegration. This was statistically significant. The peripherally expandedcomponents also had a greater number of screws inserted at the time of surgery, felt by us to bea reflection of initial surgeon dissatisfaction with component stability at the time of insertion ofthe component.Saturday, October 9, 2010, 13:30-14:20Session B20: Hip ArthroplastyA Prospective Randomized Controlled Trial Comparing Three Alternativefile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]