Analysis of the Ankle Functional Instability Based on the Three-Dimensional Shape of Ankle Posture

To evaluate the ankle functional instability (AFI) we proposed an analysis approach using the three-dimensional shape of the ankle posture. The three-dimensional shape acquisition system are used the structured light projection technique, which is composed by the digital still camera and the DLP projector. The feature is easily to solve correspondence problem between the projection pattern and camera captured image. And the AFI should be evaluated by comparing the actual posture and recognized posture of the ankle. The experimental result shows the three-dimensional shape of the ankle posture are measured less 0.5mm accuracy and the AFI can be evaluated using the obtained three-dimensional shape of the ankle posture. In addition, for the AFI diagnose and ankle rehabilitation to provide an effective platform and evaluation tools.