Transient Dynamic Analysis of Gait Motion Based on Two Unilateral External Fixators

Abstract

Unilateral external fixators are commonly used to stabilize the fractured tibia bone. Compared to static fixation, axial dynamization has been shown in previous studies to promote callus formation, improve bone healing at fracture sites, and non-axial movements are not conductive to the bone healing and remodeling. In the later stage of fracture correction, patients can bear a certain load and can realize walking and other movements. Gait motion is the active axial dynamic motion. However, it is still unknown how the displacement change at the fracture site during gait movement motion. So the aim of this study is to use transient dynamic finite element method to simulate the actual walking gait process of the human body based on two unilateral fixators. The results reveal that compared Dyna-extor fixator, the Orthofix fixator has a better stability and flexibility during active dynamization motion. This study helps clinicians to plan and execute to training patients, meanwhile facilitates appro priate application of fixators to achieve either active or controlled axial dynamic movement, so that the orthopedist has a better understanding of the biomechanical environment at the fracture site.