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Lateral ankle sprains are common in indoor sports, and most of these injuries occur via a ‘non-contact’ injury mechanism in which the only contact is between the shoe and the floor.1 2 Shoe–surface friction is generally high in indoor sports, and this attribute is considered a risk factor for non-contact lower extremity injuries.3
Spraino is a novel low-friction patch that is attached to the outside of sports shoes, specifically designed to prevent ‘friction-related’ ankle sprains in indoor sports by minimising friction at the lateral edge of the shoe sole. The minimised friction causes a reorientation of the ground reaction force vector, bringing it closer towards the joint centre, resulting in a lower joint torque, which could mitigate the risk and severity of lateral ankle sprains.4
In our recent pilot randomised controlled trial (RCT), published in British Journal of Sports Medicine …
Twitter @FilipGertz, @TBandholm, @MikkelBek, @EamonnDelahunt, @adamvirgile, @KThorborg
Contributors FGL, TB, JST, MBC, SM, PBP, TBG, UK, ED and KT wrote the original paper on which this text and infographic is based. AV designed the infographic for this paper. All authors approved the final version.
Funding The original research (on which this infographic is based) was funded by Copenhagen Center for Health Technology (CACHET), grant number RFH-15–00013 and Innovation Fund Denmark, grant number 7038-00087A.
Competing interests TBG is the founder of Spraino ApS. FGL is a paid employee in Spraino ApS. Spraino ApS was responsible for provision of Spraino in the original study. The conflict was accommodated by restricting Spraino ApS and authors FGL and TBG from having any deciding role in the design of the study, in the execution, analyses, interpretation of data or decision to submit results. Statistical analyses were performed externally by JST who was blinded to group allocation. KT had full authority of the trial administration. The three senior clinical researchers (KT, TB and ED) had full authority in terms of submission for publication. Copenhagen Center for Health Technology (CACHET) and Innovation Fund Denmark had no scientific role in the trial. KT is an Associate Editor of the British Journal of Sports Medicine. ED is a Senior Associate Editor of the British Journal of Sports Medicine in the area of foot and ankle injuries.
Provenance and peer review Not commissioned; externally peer reviewed.