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  • Title: Clinic-based assessment of weight-bearing asymmetry during squatting in people with anterior cruciate ligament reconstruction using Nintendo Wii Balance Boards.
    Author: Clark RA, Howells B, Feller J, Whitehead T, Webster KE.
    Journal: Arch Phys Med Rehabil; 2014 Jun; 95(6):1156-61. PubMed ID: 24642197.
    Abstract:
    OBJECTIVE: To use low-cost Nintendo Wii Balance Boards (NWBB) to assess weight-bearing asymmetry (WBA) in people who have undergone anterior cruciate ligament reconstruction (ACLR), and to compare their results with a matched control group. DESIGN: Quantitative clinical study using a cross-sectional design. SETTING: Orthopedic clinic of a private hospital. PARTICIPANTS: ACLR participants (n=41; mean age ± SD, 26.0 ± 9.8 y; current Cincinnati sports activity level, 75.3 ± 19.8) performed testing in conjunction with their routine 6- or 12-month clinical follow-up, and a control group (n=41) was matched for age, height, body mass, and physical activity level. INTERVENTIONS: Participants performed double-limb squats while standing on 2 NWBBs, 1 under each foot. MAIN OUTCOME MEASURES: The WBA variables mean mass difference as a percentage of body mass, time favoring a single limb by >5% body mass, absolute symmetry index, and symmetry index relative to the operated or matched control limb were derived. Mann-Whitney U tests were performed to assess between-group differences. RESULTS: Significant (P<.05) increases in asymmetry in the ACLR group were found for all outcome measures except symmetry index relative to the operated limb. CONCLUSIONS: People who have undergone ACLR are likely to possess WBA during squats, and this can be assessed using low-cost NWBBs in a clinical setting. Interestingly, the observed asymmetry was not specific to the surgical limb. Future research is needed to assess the relationship between WBA early in the rehabilitation process and long-term outcomes.
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