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of the tensor (Fig. 1B). During each measurement, the thigh and knee were aligned so as toeliminate the external load on the knee at each flexion angle.To explore the joint gap of medial and lateral compartment, "medial and lateral compartmentgap" were calculated using the following parameters: joint component gap (center gap),ligament balance (varus angle), and width between medial and lateral apex of femoralcomponent representing the contact points to polyethylene insert. Thus, medial compartmentgap is defined as “center gap” - 0.5 × “width between medial and lateral apex of femoralcomponent representing the contact points to polyethylene insert” × sin “varus angle”, andlateral compartment gap is “center gap” + 0.5 × “width between medial and lateral apex offemoral component representing the contact points to polyethylene insert” × sin “varus angle”.After expressing each measurement as a mean ± standard error of the mean (SE), we utilized astatistical software package (Statview 5.0, Abacus Concepts Inc, Berkeley, CA) to analyze thedata. We performed repeated measured of analysis of variance (ANOVA) to compare the softtissue balance of three groups, and performed a post hoc analysis by Fisher’s PLSD test. P 20º group.In assessing the kinematics of the joint component gap, knees significantly increased in thejoint component gap until 90º of knee flexion, and then significantly decreased toward deepknee flexion in all three groups (Fig. 2). This pattern of joint gap showed no significantdifference among the three groups in each angle (Fig. 2).The mean values of varus angle with the knee at 0, 10, 45, 90 and 135 degrees of flexion were1.4, 1.5, 2.2, 3.4 and 3.6 ° in the varus alignment < 10º group, 2.3, 2.6, 3.3, 4.5 and 4.9 ° in the10º < varus alignment < 20º group, and 4.2, 4.5, 6.3, 7.1 and 6.7 ° in the varus alignment > 20ºgroup.In assessing the kinematics of the varus imbalance, there were slow increases in the varus anglefrom extension to 90º of knee flexion. During flexion beyond 90º, the size of the varus anglekept constant values (Fig. 3). The varus angle in the varus alignment > 20º group showedsignificantly larger values compared to those of the other two groups in each angle (p