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grade C2 cementing.There were 22 acetabular revisions. 11 hips underwent isolated liner exchange for severe wearand osteolysis and in remaining 11 hips, complete acetabular component revision wasperformed. Indications for acetabular component revisions were aseptic loosening in five,severe lysis in four, extensive wear and metallosis in one, and liner dissociation in one. In onehip, with a fractured acetabular component due to severe pelvic bone defect, both thecomponents were revised.Conclusion:Our results suggest that an early failure of the precoated femoral stem was mainly precipitateddue to insufficient cementing technique (a thin cement mantle). Inherent flaws of the stemdesign may also accelerate the mechanism of failure.Friday, October 8, 2010, 8:40-9:50Session B10: Navigation and Robotics in ArthroplastyEarly Experience With Customized, Patient Specific Unicompartmental andBicompartmental Knee Arthroplasty*Raj Sinha - JFK Memorial Hospital - La QUINTA, United States*Email: rajsinha@mac.comINTRODUCTION: Unicompartmental knee arthroplasty (UKA) has been shown to have manybenefits over conventional Total Knee Arthroplasty (TKA), but has also been shown to betechnically difficult. In fact, technical error is the most common cause of premature failure inUKA. Bicompartmental arthroplasty (BKA) has the potential to perform like TKA with thebenefits of UKA. We describe the initial experience with customized alignment guides andimplants for UKA and BKA, manufactured based upon preoperative CT scan.MATERIALS AND METHODS. Twenty three implants in 19 patients were implanted andfollowed for a minimum of three months postoperatively. Knee society scores and SF-12 scoreswere collected preoperatively and postoperatively. Radiographs were analyzed with imageanalysis software for malposition and loosening.RESULTS. There were 11 female patients who received 12 implants, and 8 male patients whoreceived 11 implants. There were 8 BKA(7 med + pfj; 1 lat + pfj) and 15 UKA (13 medial, 2lateral). The average age was 69.3 years (range 53-91). Length of followup was average 8.9months (range 3-19). By 1 month postoperatively, all patients had gained at least 90 degrees offlexion (avg 109; range 90-130) and all were off assisted devices. By 3 monthspostoperatively, average KSS had improved from 52.8 to 89.6 (pain); 50.9 to 69.9 (function).SF-12 scores for PCS and MCS increased from 34.6 to 39.3 and 50.3 to 55.3, respectively.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]