Computer assisted surgery improved alignment in TKA: A prospective, randomized, multi-center study

摘要

Introduction: Total knee arthroplasty (TKA) long-term outcomes depend on accuracy of limb alignment, component positioning and ligament balancing. The primary aim of this study was to investigate whether computer assisted surgery (CAS) improved immediate postoperative alignment measured using standardized full-length radiographs. Methods: A series of 208 TKAs at eight US institutions were prospectively randomized to receive conventional or CT-free CAS TKA. All sites were experienced orthopaedic surgeons who were also familiar with CAS surgical techniques. The same posterior stabilized knee implant system was used for all subjects. A tibia-first surgical technique was used. All Subjects were followed at 4 weeks, 8 weeks, 12 weeks, 6 months, 1 year and 2 years. Alignment data was collected preoperatively and postoperatively at 12 weeks and 2 years. Optimal postoperative alignment was defined as a maximum difference of plus or minus 3 degrees between "planned" and "achieved" alignment. Results reported are mean and standard deviations (SD).