Figure 4. a) Mean lift-up index; b) mean impact index in the unaffected side and affected side conditions of the normal control group, acute and chronic ACLD groups. c) Contribution to the lift-up index; d) contribution to the impact index of bilateral legs in the normal control and both ACLD groups. The abbreviation legend: Ac-U: acute ACLD group in the unaffected side condition; Ac-A: acute ACLD group with affected side condition; Ch-U: chronic ACLD group with unaffected side condition; Ch-A: chronic ACLD group with affected side condition. * : p < 0.05 in ANOVA; †: p < 0.05 in paired t-test.