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PURPOSE: The purpose of this study was to compare force distribution in patients with ACLR during a squatting task at two time points post ACLR. METHODS: Thirty patients with primary, unilateral, and uncomplicated ACLR (19M/11F, 22.2±10.2 yr, 174±10.2cm, 76.4±14.9kg, 4.70±1.66 months post ACLR) were evaluated at 2 visits (V1 and V2) 2 months apart and before release to unrestricted physical activity. Patients stood with feet shoulder width apart, each foot on independent, instrumented pressure mat performing three sets of squats at a standardized pace. Changes in pressure were converted to force for analysis. Force distribution between limbs was recorded and LSI between limbs during each frame of the trial was calculated. Then, we calculated average number of frames where pressures exceeded 90% side-side symmetry were divided by the total frame number for each 3-squat trial. A higher %LSI value represents more time squatting with symmetric side-side force distribution. %LSI values at V1 and V2 post ACLR were compared using a paired samples t-tests. Cohen's D effect sizes were calculated. Alpha level was 0.05. RESULTS: %LSI at V1 (0.25±0.17%) was not statistically significantly different compared to V2 (0.19±0.16%), p = 0.07, Cohen's d = 0.34. Ten patients improve their %LSI values from V1 to V2 (See Figure 1.). CONCLUSION: No significant differences in %LSI were observed, on average in patients with ACLR over time. However, it is clinically relevant to observe a lower proportion of patients performing repetitive squats less symmetrically later in the phases of rehabilitation. Future work should identify potential sources of compensatory movement patterns that may influence symmetry during functional movements. [ABSTRACT FROM AUTHOR]