Purpose: The objective of this study was to compare the influences of AS and ACLR on static postural control among amateur athletes. Materials and Methods: Ten subjects having ACLR with mean age, height and body mass of (23.9yrs± 4.4yrs), (1.77m ± 0.06m) and (81.6kg ± 12.95kg) respectively, were selected as experimental group I. Another 10 subjects who were injured by AS with mean age, height and body mass of (24.4yrs± 4.4yrs), (1.79m ±0.08m) and (74.63kg ± 11.48kg), respectively were served as experimental group II. Also, 10 able-bodied subjects were selected as control group. A Kistler force plate was used to record the sway of the feet center of pressure (COP) Six different conditions including a) standing on the injured foot, b) standing on the uninjured foot, and c) standing on both feet, in both closed and open eyes conditions were used for balance evaluations. For statistical analysis Repeated Measure (GLM) technique with Tukey post-hoc test and α<0.05 was used. Results: In eyes open condition, COP sway was similar in all groups (p=0.364).Closed eyes resulted in a significant increase in the COP sway which was differently distributed among groups (p = 0.04). This study reveals that ACLR and AS injuries have minimal effects on static standing postural control in eyes open condition. Single-limb standing without visual inputs resulted in a significantly greater COP sway in soccer players with ACLR and AS injuries, implying a proprioception deficit. Postural control on standing over the intact foot showed greater COP sway than that of the injured foot. Conclusion: It is recommended to repeat this study in dynamic conditions to have a better understanding of this issue.
