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surfaces of the femur and the tibia, (2) more than 10 mm of joint component gap, and (3) lessthan 5 cm of MCL release from the joint surface. In all knees with varus deformity, step by stepappropriate release of medial side soft tissue (posteromedial capsule, medial collateral ligament(MCL), semimembranosus, and pes anserinus tendons) was performed with a spacer block, inwhich residual lateral laxity especially at flexion was allowed. Finally, joint component gap andvarus angle were assessed at 0, 10, 45, 90 and 135° of flexion with femoral trial prosthesisplaced and PF joint reduced. [Results] Joint gap measurement showed no significant differenceregardless the amount of pre-operative varus alignment (Fig.1). With the procedures of softtissue release avoiding joint line elevation, however, intra-operative varus angle with preoperativevarus alignment of more than 20 degrees exhibited significant larger values comparedto those with pre-operative varus alignment of less than 20 degrees throughout the range ofmotion (p