Abstract
BackgroundThe purpose of this study was to determine the effect of intraoperative coronal laxity in total knee arthroplasty on the postoperative condition. MethodsWe conducted stress arthrometric studies using a Telos arthrometer on 40 knees in 36 patients. Both posterior cruciate ligament-retaining (PCLR) prostheses and posterior cruciate-sacrificing (PCLS) prostheses were placed in 20 knees respectively. All of the TKA procedures were judged clinically successful (Hospital for Special Surgery scores: PCLR 92±3 points, PCLS 91±4 points). Laxities were measured under spinal anesthesia (immediately postoperatively) and 6months postoperatively. ResultsPCLR prostheses had an average of 2.9°±1.8O and 3.0°±1.2O in abduction and 4.4°±2.8O and 3.6°±1.5O in adduction under anesthesia and the postoperative condition. PCLS prostheses had average laxities of 3.8°±1.4° and 3.5°±0.9° in abduction and 4.6°±3.8° and 4.0°±1.7° in adduction. There were no significant differences between them. ConclusionsThe findings suggest that surgeons should emphasize the achievement of suitable laxity under anesthesia to ensure the success of total knee arthroplasty.
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