Orthopedic & Muscular System: Current Research
Open Access
ISSN: 2161-0533
+44-77-2385-9429
ISSN: 2161-0533
+44-77-2385-9429
Yijun Zhang
Posters-Accepted Abstracts: Orthop Muscular Syst
Background: The purpose of this study was to explore the correlation between the rotation and translation of each joint in the hindfoot and the medial arch angle change in stage II posterior tibial tendon dysfunction flatfoot three-dimensionally under loading. Methods: CT scans of 12 healthy feet and 12 feet with stage II posterior tibial tendon dysfunction flatfoot were taken first in non- weight-bearing condition, followed by a simulated full-body-weight-bearing condition. The CT images of the hindfoot bones were reconstructed into three-dimensional models with Mimics and Geomagic reverse engineering software. The threedimensional changes of the talocalcaneal joint, the talonavicular joint and the calcanocuboid joint were calculated to determine their correlation to the medial longitudinal arch angle. Results: From non- to full-body-weight-bearing condition, the medial arch angle change was larger (p=0.001) in stage II posterior tibial tendon dysfunction flatfoot deformity compared to that in healthy foot. The rotation and translation of the talocalcaneal joint, the talonavicular joint and the calcanocuboid joint had little influence on the change of the medial arch angle in healthy foot. However, the eversion of the talocalcaneal joint (r=0.5099 p=0.0413), the proximal translation of the calcaneus relative to the talus (r= 0.5711 p=0.0085) and the dorsiflexion of talonavicular joint (r=0.6999 p=0.0006) were significantly correlated to the medial arch angle change in stage II posterior tibial tendon dysfunction flatfoot deformity. Conclusion: Joint instability occurred in the hindfoot in simulated full-body-weight-bearing condition in patients with stage II posterior tibial tendon dysfunction flatfoot. Limitation of over movement of the talocalcaneal joint and the talonavicular joint may help correct the medial longitudinal arch in stage II posterior tibial tendon dysfunction flatfoot.