Background: Anterior cruciate ligament reconstructed (ACLR) patients have been found with altered landing strategies in injured leg even after return to sports. Dynamic postural control is described as a complicated coordinating result of individuals to receive signals from visual, vestibular and somatosensory system then process through center nervous system and finally respond. In landing tasks, they provide more stimulation of feedforward components in sensorimotor control and higher ground reaction force than static balancing, they can also reflect our moving patterns in sport better. As a result, landing tasks are often used as a screening procedure of dynamic postural control. The developed dynamic postural control indexes Time to stabilization (TTS) and dynamic postural stability index (DPSI) in ACLR, and the jump-landing tasks of choice for ACLR are still lack of investigation. Purpose: To discuss dynamic postural control of anterior cruciate ligament reconstructed individuals after return to play with TTS, and DPSI during single-leg vertical jump and single-leg forward hop. Methods: 10 healthy and 10 ACLR subjects were recruited and asked to perform above mentioned tasks in random orders. One Kistler force plate will used for the kinetic data collection at 1000 Hz. Each subject was asked to perform 3 successful single-leg forward hops and 3 successful single-leg vertical jumps. Healthy group and ACLR group were asked to perform with both legs. For each landing, subjects were instructed to stabilize as quickly as possible. Two-way analysis of variance (Two-Way ANOVA) was used for analyzing the differences of TTS and DPSI between ACLR and Healthy group. Post-hoc analysis was performed using t-test with Bonferroni if there was statistically significant in Two-Way ANOVA. Significant level was set at α=.05. Results and conclusion: There were significant differences in mediolateral TTS between ACLR and Healthy group In ACLR group, ML_TTS of ACLR side was significantly higher than contralateral limb (p=0.012). There were significant differences between the two groups in mediolateral TTS (between ACLR and healthy matched limb, p=0.037; between ACLR and healthy contralateral limb, p=0.020). Individuals still show dynamic postural control deficiency through TTS screening while performing SLVJ. Mediolateral directional control of single-leg vertical jump might be more challenging for ACLR’s reconstructed side. There was no significant difference of DPSI between groups and limbs.

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