A pre-operational study magnification measurement and error estimation of residual tibia kinematics within below knee prosthetics
Editors: Araujo, A., Herskovits, J., Rodrigues, H.C., Soares, C.M.M., Folgado, J.O., Moleiro, F. and Madeira, F.
Publisher: CRC Press/Balkema
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Journal: Engineering Optimization IV - Proceedings of the 4th International Conference on Engineering Optimization, ENGOPT 2014
© 2015 Taylor & Francis Group, London. Historically the measurement of vertical displacement (pistoning) of residual limb bones has been performed with markers placed on the surface of the socket and skin. This attempts to infer positional changes externally or within a simulated gait cycle, using static positions utilising static x-rays to visualise the movement of the bone itself. In this study the design optimisation of a biomedical experiment to quantify the movement of residual bones post amputation within the socket of their prosthesis is considered. A videofluoroscopic imaging protocol for the stump and socket of lower limb amputees is presented in an attempt to generate accurate and reliable data for stump/socket kinematics from images acquired at sub-second intervals. The protocol combines the above techniques to produce measurements of displacement that account for the distortion effects of medical imaging; that is, magnification errors and systematic errors generated by rotational motion out-of-plane to the imaging.A statistical analysis of these images is considered to quantify any difference in measurement when a 90° rotation of the stump and socket is performed.