Response of the Peroneal Muscles to Sudden Inversion of the Ankle during Standing
in Journal of Applied BiomechanicsClick name to view affiliation
The response of the peroneal muscles to sudden inversion of the ankle during standing was investigated. The variation of the inversion angle with time was measured by means of a potentiometer attached to a specially designed test apparatus. During the tests, volunteers were subjected to sudden and unexpected inversion of their ankle, during which the surface EMG of the peroneal muscles was also recorded. Two groups were tested, one of normal subjects and one consisting of subjects with recurrent ankle sprains. There were 8 females and 3 males in each group. The subjects in the second group, who suffered from recurrent ankle sprains, had been asymptomatic during the last 2 months prior to the tests. For each subject in the two groups, both ankles were tested. The results indicated a latency time ranging from 60 to 80 ms for both groups. It was concluded that the reflex contraction of the peroneal muscles due to a sudden stretch inversion motion has no role in protecting the ankle joint during sprain and that this protection is mainly provided by the passive tissues.
Eli Isakov, Pablo Solzi, and Zev Susak are with the Loewenstein Rehabilitation Hospital in Raanana, Israel. Joseph Mizrahi is a faculty member of the Department of Biomedical Engineering at Technion-Israel Institute of Technology in Haifa, Israel, and is also with the Loewenstein Rehabilitation Hospital in Raanana. Moshe Lotem is a member of the Department of Orthopaedic Surgery at Meir Hospital, Kfar-Saba, Israel.
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