Biomechanical characterization and clinical implications of artificially induced crouch walking: Differences between pure iliopsoas, pure hamstrings and combination of iliopsoas and hamstrings contractures

Journal of Biomechanics
Zlatko Matjacic, Andrej Olensek

Abstract

The purpose of this study was to characterize biomechanically three different crouch walking patterns, artificially induced in eight neurologically intact subjects and to compare them to selected cases of pathological crouch walking. The subjects were equipped with a lightweight mechanical exoskeleton with artificial muscles that acted in parallel with hamstrings and iliopsoas muscles. They walked at a speed of approximately 1m/s along the walkway under four experimental conditions: normal walking (NW), hamstrings contracture emulation (HAM), iliopsoas contracture emulation (IPS) and emulation of both hamstrings and iliopsoas contractures (IPSHAM). Reflective markers and force platform data were collected and ankle, knee and hip-joint angles, moments and powers were calculated. HAM and IPSHAM shifted ankle-angle rotation profiles into dorsiflexion during midstance compared to IPS and NW where ankle-angle trajectories were similar. HAM, IPS and IPSHAM shifted the knee angle of rotation profiles into flexion during stance, compared to NW. IPS and IPSHAM shifted hip angle of rotation profiles toward pronounced flexion while HAM shifted hip angle of rotation profile toward extension, compared to NW. HAM and IPSHAM significantly inc...Continue Reading

References

Jul 1, 1997·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·L M SchutteJ R Gage
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Jul 28, 2004·American Journal of Physical Medicine & Rehabilitation·Laura W Lee, D Casey Kerrigan

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Citations

Mar 14, 2016·Clinical Biomechanics·Michael AttiasStéphane Armand
Mar 12, 2013·Gait & Posture·Julia BalzerMarietta L van der Linden
Aug 25, 2010·Journal of Pediatric Orthopedics·Susan A RethlefsenRobert M Kay

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