Static Posturographic Characteristics during Balance Control under Virtual Moving Surround in Patients with Chronic Ankle Sprain

OBJECTIVE: To investigate static posturographic characteristics during balance control under virtual moving surround (VMS) using force platform and head mount display (HMD) device in patients with chronic ankle sprain as compared with that of normal adults. METHOD: Ten patients with chronic ankle sprain and 24 healthy adults participated. Center of pressure (COP) parameters were obtained for 20 seconds using force platform as total path distance and total sway area in following conditions (1) comfortable standing with opened and closed eyes, (2) VMS delivered using HMD with four different moving patterns. The virtual moving patterns composed of close-far, superior-inferior tilting (pitch), right-left tilting (roll) and horizontal rotation (yaw) movement. RESULTS: No significant difference was found between patients with chronic ankle sprain and healthy adults on comfortable standing with both open and closed eyes. But, patients revealed significantly increased total path distance and sway area of COP on all VMS conditions. CONCLUSION: These results showed that under VMS conditions patients with the weaker balance control problem were more sensitive to balance control than simple comfortable standing conditions with opened and closed eyes.

Effect of Characteristics of Joint Motion of Lower Extremity according to Aging on Balance in Elderly

OBJECTIVE: To investigate the effect and the correlation of characteristics of joint motion of lower extremity according to aging on balance in elderly. METHOD: There were thirty nine healthy elderly subjects aged 60 and older. The subjects were divided into 3 groups by their age. Each group was measured with joint motion of bilateral lower extremities by goniometer. The subjects were evaluated with clinical balance tests [(Berg balance scale (BBS), Functional reach test (FRT), Tinetti's performance oriented mobility assessment (POMA), and one leg standing (OLS)]. RESULTS: The flexibilities of lower extremities were decreased according to the increase in age. The balance ability was also decreased according to the increase in age by tested clinical balance scores. The flexibility of the ankle joints showed the strongest correlation with clinical balance scores (BBS, FRT, POMA and OLS) according to the increase in age, and the flexibility of hip joints also correlated with clinical balance scores (POMA and OLS). CONCLUSION: Among clinically validated balance tests, the decline of balance performance related with aging. Correlation exists between ankle ROM and balance in healthy elderly people. Additional research is needed to add the ankle ROM to reflect the excise for balance tests and balance ability.