To assess the effect of PHSB training on plantar pressure distribution with CAI patients.
Thirty-two CAI patients (age 23.5 ± 4 years old, female:67% ) who meet the diagnostic criteria of the International Ankle Alliance (CAIT＜24) were randomly divided into either the training group (TG; n=16) or control group (CG; n=16). The TG conducted PHSB training which consisted of a 4-week training (20mins, 3 times per week) composed by single-limb hops to stabilization, hops to stabilization and reach, unanticipated hop to stabilization, single-limb stance activities. The control group was trained after the experiment. FreeSTEP system was used for testing and analysis. The pressure plate was 1.2 m long and 0.5 m wide, and the sampling frequency was 200Hz. The sole of the foot were divided into 8 areas: 1st to 5th metatarsal heads(M1 ～ M5), toes(T1), medial hindfoot(HM), lateral hindfoot(HL).The patients were made to walk with natural gait, and the homogenized peak force (PF/W) in each area of the plantar during 30s dynamic walking was collected and standardized according to body weight. Patients were also asked to complete the one-foot standing test with eyes open and closed for three times on the pressure plate, and the standard deviation of center of pressure (COP) moving speed, inner, outer, front and rear boundary time (TTB) were collected. Data were compared at baseline and following 4-week training by t-test.
The 4-week PHSB training significantly increased the M1, M3 and T1 of TG patients (p0.05),the inner, outer, front and rear boundary time (TTB) of TG patients(p0.05); It was observed with significantly reduction in the M5(p0.0001) of TG, as well as in the standard deviation of center of pressure (COP) moving speed(p=0.0003). No significant change were found for measured variables between Pre and Post in CG group(p>0.05).
The 4-week PHSB training improved the plantar pressure distribution of CAI patients, reduced the tendency of ankle varus, and improved the dynamic and static postural stability of CAI patients.
Impaired postural control is an important factor leading to decreased ankle function and repeated sprains. The results of plantar pressure analysis are of great significance in the diagnosis of postural control stability in CAI patients.This study explored the effectiveness of PHSB training in improving postural control and provided more practical experience and evidence for the clinical treatment of CAI.
Progressive Hop-to-Stabilization Balance training
Plantar Pressure Distribution
