Introduction: The Oxford unicompartmental knee arthroplasty (UKA) is recognized as a technically difficult procedure. As previously reported, the femoral alignment guide of the Oxford UKA does not accurately mark the anatomic axis of the femur leading to misalignment of the femoral component. This ultimately can affect the long-term survival of the prosthesis. With the development of computer-aided guidance systems, there is hope of improving alignment and hence long-term results of the Oxford UKA. Fluoroscopic computer-aided guided systems offer the benefit of not requiring registration, direct imaging of landmarks required for guidance and less-radiation exposure compared to CT-guided navigation systems. The purpose of this study was to describe one institution's experience with the Oxford UKA comparing a fluoroscopic computer-aided guided technique with a conventional non-computer assist technique. We analyzed radiographic data comparing accuracy and precision of component placement and also looked at the learning curve associated with the Oxford UKA.
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