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The effect of a novel orthosis on ankle kinematics in simulated sprain

Chrysanthou, M. (2020) The effect of a novel orthosis on ankle kinematics in simulated sprain.

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Abstract:The first line of treatment after an ankle sprain is orthosis wear. Normally the lateral ligaments stabilize the ankle in the frontal plane. When the supporting ligaments are injured post-injury, they are unable to do so, thus an external mechanical support is needed, to ensure ankle stability. Most modern ankle orthoses are stiff, restricting the foot’s movement, making them suboptimal for the joint’s function or mobility. Herein a newly designed, active orthosis that utilizes the mechanical properties of shear thickening fluids is tested. The aim of this study was to investigate the novel active orthosis during unexpected ankle inversion (i.e. sport-like movements), and the effect of a passive placebo orthosis (elastic band orthosis). Sixteen participants with ankle instability and a history of ankle-sprain, performed singlelegged drop landings and sudden inversion tilt perturbations on a motorized supination test platform, designed and constructed for this double-blinded, placebo-controlled study and compared against three conditions (i.e. active orthosis, passive placebo orthosis, and no orthosis). During ten falls at two different speeds, three-dimensional kinematic data were collected, from which ankle frontal plane angles were calculated. Assessments were performed using Statistical Parametric Mapping (SPM). Results showed that there was a significant smaller ankle inversion with the active orthosis compared to the unbraced (no orthosis) controls. In contrast, no significant difference in ankle inversion angle during sudden ankle inversion, was found between the passive placebo orthosis and unbraced (no orthosis) controls. Our findings imply that the novel, active, elastic orthosis does restrain the ankle in a sudden joint inversion, thus preventing a further sprain injury. Additionally, no apparent placebo effect was found with the passive orthosis. These results highlight the role of orthosis design on biomechanical function during sports-related and injury-prone movements.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Link to this item:http://purl.utwente.nl/essays/81523
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