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DOI: 10.1055/a-0637-2126
Step-Down Task Identifies Differences in Ankle Biomechanics Across Functional Activities
Publication History
accepted 20 May 2018
Publication Date:
19 July 2018 (online)
![](https://www.thieme-connect.de/media/sportsmed/201811/lookinside/thumbnails/6780_10-1055-a-0637-2126-1.jpg)
Abstract
Currently, there is no clinical exam to evaluate ankle frontal plane kinematics. The purpose of this study was to determine whether individuals identified as “lateral” landing during a video-recorded step-down task have differences in ankle inversion as measured with 3-dimensional motion capture during walking, step-down, and jump-landing tasks compared to individuals identified as “non-lateral”. Fifty-seven recreationally active adults completed the descriptive laboratory study. During walking, step-down, and jump-landing tasks, participants had their ankle frontal plane kinematics measured using a 3-dimensional motion capture system. In addition, during the step-down task, participants had a posterior view video of their foot recorded using a commercial camera. Following testing, a blinded-investigator scored the step-down video of all participants by classifying them as ”lateral” landing or ”non-lateral” landing. Ankle frontal plane kinematics during the walking, step-down, and jump-landing tasks were compared between the two groups (lateral (N=24) and non-lateral (N=33) using a binary logistic regression and time-series confidence interval analysis. During walking, stepping-down, and jump-landing, the lateral group had significantly more inversion at initial contact and during various other phases specific to each task. This study found that a clinical screening tool could identify individuals who have significantly more inversion during three tasks.
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