ABSTRACT
BACKGROUND: The evaluation for posterolateral rotatory dislocation of knee joint often relys on traditional imaging techniques to obtain static anatomical information; meanwhile, the knee function was assessed by Lysholm and the International Knee Documentation Committee scores. However, none can quantitatively evaluate the kinematic characteristics, let alone providing guidance for postoperative rehabilitation.OBJECTIVE: To analyze the gait characters of the patients with acute posterolateral rotatory dislocation of knee joint and to dynamically evaluate the postoperative kinematic parameters and displacement indicators, thereby providing guidance for rehabilitation.METHODS: Twelve patients with acute knee posterolateral rotatory dislocation were admitted in the West China Hospital,Sichuan University between January 2011 and December 2014, and all patients underwent one-stage reconstruction or repair of ligaments under arthroscopy, followed by routine rehabilitation training. Opti-Knee? analysis system was used to collect 6 degrees of freedom (movement angle and displacement) of the ipsilateral (injury group) and contralateral knee joints (normal group), the change levels were calculated, and were then compared between two groups.RESULTS AND CONCLUSION: (1) There was no significant difference in the maximum varus/valgus angles and maximum intersion/extorsion angles (P > 0.05). While, the minimum flexion angle, maximum flexion angle, as well as the change level of flexion/extension angles, varus/valgus angles and maximum intersion/extorsion angles in the injury group were significantly higher than those in the normal group (P < 0.05). (2) There was no significant difference in the maximum forward, inward and outward displacement as well as the change levels of inward/outward displacement between two groups (P > 0.05). The maximum backward, and downward displacement as well as the change levels of forward/backward displacement in the injury group were significantly higher than those in the normal group; while the maximum upward displacement and the change levels of upward/downward displacement in the injury group were significantly lower than those in the normal group (P < 0.05). (3) These results suggest that the arthroscopy-assisted one-stage treatment of the acute posterolateral rotatory dislocation of the knee joint can remarkably restore the gait.Opti-Knee? analysis system can provide objective information of motion parameters, and the change in the degree of freedom provides guidance for clinical rehabilitation.