Evaluation of angular kinematics of lower limb amputees using quantitative fluoroscopic imaging
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Journal: ECCOMAS Congress 2016 - Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering
In the design of a functional prosthetic socket for lower limb amputees it is desirable to mimic the actions of a healthy limb as close as possible. While limiting the degree of freedom to which the residual limb is able to move in the prosthetic socket during ambulation (walking) is a prerequisite for an adequate fitting, with inadequate understanding of the specific anatomy of the patient including residuum changes after amputation, an overly tight socket fit can lead to pain, pressure ulcers and infections. Furthermore, changes in the initial alignment between the residual limb and socket have been shown to affect the pressure distribution within the socket. The purpose of this study was to measure and report the angular kinematic data/variables of lower limb amputees under protocols designed to infer the kinematics within the socket during walking and static weight hold on the artificial limb. The study details the angular motion kinematics of the tibia within the residuum with and without the addition of a 5kg mass used to replicate forces applied to the residual limb while undergoing the swing phase of slow and fast walking. Using quantitative fluoroscopic imaging techniques, continuous frame by frame tracking of tibia and prosthesis have been recorded and measures of residual limb/tibia angular kinematic have been performed. The understanding of the angular motion of the tibia within the residuum conveys a new insight in socket design (comfort and performance considerations) and furnishes a straightforward view into the effects of surgical amputation and prosthetic fit techniques.