The purpose of this study was to determine if total hip replacement (THR) compromises the body's ability to maintain balance. This study examined postural sway in single-limb stance, comparing the operated and non-operated lower extremities in nine subjects, mean age 64 years (range 48-71; four female, three male) between six and ten months post THR. Comparisons were made to a control group of ten individuals, mean age 59 years (range 50-70 years; four female, six male) who had no history of injury or surgery in bilateral lower extremities. Each subject in the study underwent postural sway testing on the Chattex Balance System, strength testing of the hip flexors and abductors, and completed questionnaires providing information on their frequency of activity and functional status. The results of this study indicated that THR does not adversely affect the body's ability to maintain balance in static single limb stance. No significant difference in postural sway was exhibited between the operated, non-operated and control groups. Furthermore, there was found to be no statistically significant correlation between either strength, activity level, or functional status and postural sway.
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