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Symposium #7

Quantitative Analysis of the Mechanism of Ankle Inversion Sprain Injury

Symposium Chair: Daniel Fong

Background & Relevance: Ankle sprain is very common in sports. The clinically presented mechanism has been described as excessive inversion, or supination, in the literature. In order to help devise injury prevention strategies, it is essential to investigate the injury mechanism with biomechanics quantities.

The mechanism has been investigated extensively in laboratory with platforms with trapdoors or different types of sprain simulators, however, as these devices did not introduce real injuries, the findings could not fully represent the biomechanics of real ankle sprain injuries. The most direct way to study the mechanism is to investigate the real injuries, and a handful of accidental cases in laboratory and real cases during sports have been presented in the literature since 2009. They generally presented the mechanism as excessive inversion, with the range of inversion and the maximum inversion velocity quantified. However, they also did not show great plantarflexion or supination, but suggested that internal rotation could have been missed before.

In this symposium, authors of the some of the above mentioned quantitative case reports will present their cases and their methods to analyse. Some of these cases have caused ligamentous sprain injuries, and some have only caused ‘giving way’ at the ankle joint with minimal damage to the tissues and structure. At the end, the speakers will summarise the current findings and will discuss what’s next on this research direction.

Speaker 1: Dominic Gehring

Presentation title: Kinematics, kinetics and neuromuscular activation of an ankle sprain during a run-and-cut movement

Speaker 2: Uwe Kersting

Presentation title: Understanding ankle sprains mechanics

Speaker 3: Masafumi Terada

Presentation title: Does proximal joint function contribute to ankle sprain mechanisms?

Speaker 4: Alexandria Remus

Presentation title: The first ever laboratory captured "giving way" episode in an athlete with CAI during performance of the Agility T-Test

Speaker 5: Daniel Fong

Presentation title: Summarising the ankle sprain cases reported in the literature: what have we learned  and what’s next?