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INTRODUCTION Altered movement patterns influence the clinical outcome of people with chronic ankle instability (CAI)[1]. Given the directional changes involved in many sports, we aimed to study ankle and foot kinematicsduring side-cutting in participants with CAI compared to those who recovered from ankle sprains (i.e.copers). METHODS Thirteen physically active males with CAI and 14 copers were enlisted [1]. The most affected ankleaccording to the CAIT score was examined, or alternatively the dominant side. FAAM subscales evaluatedself-reported function. Reflexive markers were placed according to the Pug-in gait and the IOR-4segment model to quantifyankle (rigid foot), shank-calcaneus, Chopart, Lisfranc and first metatarsophalangeal joint (segmentedfoot) [2]. Participants performed 5 barefoot side-cutting trials at 3.3m/s. The joint 3D rotations weretime-normalized from 0 to 100% of the stance phase. Statistical Parametric Mapping (SPM) tested forsignificant differences between groups, with alpha risk of 5% [3]. RESULTS The age and body mass index were comparable in the two groups, with 25.0 [22; 31] years and 23.2 [21.6;27.9] kg/m² in CAI, and 25.5 [24; 27] years and 24.6 [22.1; 25.7] kg/m² in copers. Individuals with CAI exhibited altered CAIT (17 [12.5; 20]), FAAM daily life (92.9% [78.8; 97.6]) and FAAM sport (87.5% [65.6;95.3]) scores, while copers had almost maximal scores. The ankle joint was significantly less plantarflexed between 41 and 48% of stance in CAI than in copers(p=0.039). An exploratory inspection of the other data showed that CAI seemed to have a less dorsiflexed and moreadducted shank-calcaneus and a more inverted Chopart compared to copers. For Lisfranc and the firstmetatarsophalangeal joint, kinematic patterns were similar between groups. DISCUSSION This is the first comparison of multi-segment ankle and foot side-cutting kinematics between individualswith CAI and copers. The application of SPM is crucial as relying solely on isolated values (e.g. localpeaks) can result in reversed trends [3]. During side-cutting, a previous study showed less shank-calcaneus abduction in those with perceivedinstability compared to those who had also mechanical instability [4]. During running, changes at shank- calcaneus and Chopart were observed [2]. Similarly, we observed non-significant kinematic differences at these joints. These initial findings need further validation through increased participant recruitment to ensure sufficient statistical power.
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Peters-Dickie, J.-L., Detrembleur, C., Lobet, S., & Deschamps, K. (2024). Ankle and foot kinematics during side-cutting in participants with chronic ankle instability compared to sprain copers. 10th International Ankle Symposium, Strasbourg, France. https://hdl.handle.net/2078.5/269198