![]() The mean gap inclination angle with the trial component (3.7° ± 0.62°) was significantly smaller than that without the trial component (5.5° ± 0.78°). The mean joint gap size with the trial component (13.4 ± 0.80 mm) was significantly smaller than that without the trial component (14.7 ± 0.84 mm). The postoperative flexion gap size and inclination during 90° flexion were compared between cases with and without the trial component. ![]() This prospective study included 21 consecutive patients aged 78 years with medial osteoarthritis who underwent cruciate-retaining TKA between February 2017 and March 2018. This study aimed to evaluate the effect of the trial component on the flexion gap. ![]() We manufactured a distal femoral trial component to reproduce the condition after implantation and prior to posterior condyle osteotomy. The tension of the lateral compartment during 90° flexion may also be reduced after osteotomy of the distal femur. ![]() However, after osteotomy, the flexion gap size during 90° knee flexion may be larger than that observed after implantation. In total knee arthroplasty (TKA) using the modified gap technique, the soft-tissue balance is measured after osteotomy of the distal femur and proximal tibia (conventional bone gap). ![]()
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