Article

AIM: To explore long-term consequences of anterior cruciate ligament (ACL)
rupture on postural sway and control strategies during bilateral quiet standing,
in subjects treated with or without reconstructive surgery compared to uninjured
controls. METHOD: 70 individuals who had unilateral ACL rupture 23+/-2.4 years
ago (33 received ACL reconstructive surgery, ACLR, and 37 had physiotherapy only,
ACLPT) and 33 uninjured matched controls (CTRL) (mean age 46+/-5.3) stood quietly
with eyes closed for 3min on a firm and on a compliant surface, respectively.
Center of pressure (CoP) was registered with a force plate and postural sway was
calculated from center of mass (CoM) derived from 3D kinematics. Sway density
(SD) analyses of CoP assessed distance and duration of stable phases. The torque
controlling postural sway was estimated from CoP-CoM. RESULTS: Comparisons across
conditions to CTRL revealed larger CoP-CoM-area in ACLR (p=0.017, CI: 10.95,
143.10), but not in ACLPT. Mean distance between SD-peaks was greater for ACLR
(p<0.001, CI: 1.73, 5.31) than for ACLPT (p=0.006, CI: 0.56, 4.12) relative to
CTRL. Duration of SD-peaks was smaller for both ACLR and ACLPT (p<0.001, CI:
-4.04, -1.23 and -3.82, -1.03, respectively) compared to CTRL. CoM-area in the
ACL-groups did not differ from CTRL. CONCLUSIONS: ACL-injured subjects
demonstrated greater postural control efforts than CTRL but without significant
differences in postural sway. Control efforts were thus not directly associated
with sway and further research should be focused on variance in postural control
strategies.
CI - Copyright (c) 2016. Published by Elsevier B.V.

Langue : ANGLAIS