| Objective: To study the reliability and validity of the dynamic and static balance instrument used to assess ankle's stability degree so as to provide objective basis for the clinical practice. Methods: The enrolled included 32 patients with chronic ankle instability (CAI group) and 30 normal people (normal group). The affected ankle in the CAI group and the unilateral ankle in the normal group were assessed by Pro kin body feeling pre-assessment of dynamic and static balance, multi axis ontology sensory evaluation and David kotok ankle instability evaluation questionnaire three times. The average values of Pro-kin body feeling pre assessment of dynamic and static balance and average values of multi axis ontology sensory evaluation were separately compared with those of David kotok unstable evaluation questionnaire scores in order to test the validity of Pro-kin dynamic and static balance instrument. The ICC was used to analyze the data of 62 cases for testing the reliability of Pro kin dynamic and static balance instrument. The David kotok ankle instability evaluation questionnaire scores in normal group and CAI group were compared by t test to test the sensitivity of Pro-kin dynamic and static balance. Results: For Pro kin dynamic and static balance instrument, multi axis proprioception evaluation indicators including the average trajectory difference and the average load power difference had a moderate negative correlation with David kotok ankle instability evaluation questionnaire score (r=0.421, and 0.419, P<0.05). Proprioception pre assessment indicators including front and behind stability index, left and right stability index, A2-A6 stability index, A4-A8 stability index, and circular stability index had weak correlation with David kotok ankle instability evaluation questionnaire score (r=-0.057, -0.003, -0.013, -0.129, -0.164, P<0.05). Pro-kin repetitive measure reliability (ICC) of dynamic and static balance was 0.831-0.959, and 95% CI was concentrated. The reliability among the investigators was 0.798-0.961,and 95% CI was concentrated. The multi axis proprioception evaluation indexes showed no statistically significant difference between the normal group and CAI group (P<0.05). Conclusion: The average trajectory difference and average load difference for multiaxis proprioception assessment test in Pro-kin dynamic and static balance instrument can be used to assess the stability of ankle joint and have high sensitivity, and Pro-kin dynamic and static balance instrument has high reliability in measuring ankle stability. |
