Ankle sprain injury is very common in sports. In order to design solutions to monitor the joint motion and provide correction when needed, it is necessary to quantify the injury mechanism with measurable parameters.

Studying the mechanism of ankle sprain injuries is challenging because they cannot be mimicked in a laboratory. Therefore, this project employs a skeleton-matching method to allow analysis of the motion during real injury incidents.

So far eight cases have been reported and the results suggest that a fast twisting velocity is associated with injury to the ankle ligaments, and that this can happen within a normal range of inversion. The data are being used to derive a wearable anti-sprain device to provide protection to the ankle joint when the twisting velocity exceeds a safe threshold.

Institutions / organisations and researchers

Loughborough University

The Chinese University of Hong Kong

  • Professor Kai-Ming Chan
  • Professor Patrick Yung
  • Dr Kam-Ming Mok

Oslo Sports Trauma Research Centre

  • Dr Tron Krosshaug
  • Dr Lars Engebretsen
  • Dr Yosuke Shima


  • We have discovered that lateral ankle sprain is caused by an excessive inversion velocity, which can be as high as 600-1800 deg/s.