via Gait & Posture - Articles in Press by Kota Watanabe, Harold B. Kitaoka, Tadashi Fujii, Xavier Crevoisier, Lawrence J. Berglund, Kristin D. Zhao, Kenton R. Kaufman, Kai-Nan An on 8/31/12
Highlights: ► We examined the flatfoot motion utilizing a dynamic foot-ankle simulator. ► Magnetic tracking system monitored the cadaver foot bone movements 3-dimensionally. ► Kinematics in the intact condition were consistent with normal gait analysis data. ► Kinematics altered in the flatfoot condition in coronal and transverse planes. ► The simulated flatfoot was consistent with patients data with flatfoot.Abstract: Many biomechanical studies investigated pathology of flatfoot and effects of operations on flatfoot. The majority of cadaveric studies are limited to the quasistatic response to static joint loads. This study examined the unconstrained joint motion of the foot and ankle during stance phase utilizing a dynamic foot–ankle simulator in simulated stage 2 posterior tibial tendon dysfunction (PTTD). Muscle forces were applied on the extrinsic tendons of the foot using six servo-pneumatic cylinders to simulate their action. Vertical and fore-aft shear forces were applied and tibial advancement was performed with the servomotors. Three-dimensional movements of multiple bones of the foot were monitored with a magnetic tracking system. Twenty-two fresh-frozen lower extremities were studied in the intact condition, then following sectioning peritalar constraints to create a flatfoot and unloading the posterior tibial muscle force. Kinematics in the intact condition were consistent with gait analysis data for normals. There were altered kinematics in the flatfoot condition, particularly in coronal and transverse planes. Calcaneal eversion relative to the tibia averaged 11.1±2.8° compared to 5.8±2.3° in the normal condition. Calcaneal-tibial external rotation was significantly increased in flatfeet from mean of 2.3±1.7° to 8.1±4.0°. There were also significant changes in metatarsal-tibial eversion and external rotation in the flatfoot condition. The simulated PTTD with flatfoot was consistent with previous data obtained in patients with PTTD. The use of a flatfoot model will enable more detailed study on the flatfoot condition and/or effect of surgical treatment.
The British Association of Prosthetists and Orthotists (BAPO) was established to encourage high standards of prosthetic and orthotic practice. It is committed to Continued Professional Development and education to enhance standards of prosthetic and orthotic care. BAPO is the only UK body that represents the interests of prosthetic and orthotic professionals and associate members to their employers, BAPO enjoys the support of a high majority of the profession as members.
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