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Prolonged Peroneal Reaction Time in Ankle Instability L. Konradsen1, J. Bolisen Ravn2 Department of Orthopedics, County Hospital, Hillerød' and the Biomechanical Laboratory, Gentofte Hospital, University of Copenhagen2, Denmark
L. Konradsen and J. Bohsen Ravn, Prolonged Peroneal Reaction Time in Ankle Instability. mt J Sports Med,Vol 12,No3,pp290—292, 1991.
bility (5, 14, 18, 19). Proposed causal factors include tibiofibular sprains (16), peroneal weakness (1) and post-injury proprioceptive deficit (4, 5). The presence of a proprioceptive deficit
was suggested after a connection had been established between functional instability and an impaired ability to maintain postural control during single limb stance (5, 19).
Accepted after revision: June 26, 1990
The peroneal reflex time to sudden ankle in-
version and the postural control of 15 athletes with functionally instable ankles were compared with 15 stable controls. A trapdoor produced sudden ankle inversion. Surface electrodes recorded electromyographic activity of the peroneal muscles. Postural sway was expressed by a transverse sway value obtained during single limb stance on a force plate. Increased postural sway was found in subjects with functional instability (p < 0.01). This is in accordance with previous studies. Functionally instable subjects also displayed an increased peroneal reaction time (p
Prolonged Peroneal Reaction Time in Ankle Instability L. Konradsen1, J. Bolisen Ravn2 Department of Orthopedics, County Hospital, Hillerød' and the Biomechanical Laboratory, Gentofte Hospital, University of Copenhagen2, Denmark
L. Konradsen and J. Bohsen Ravn, Prolonged Peroneal Reaction Time in Ankle Instability. mt J Sports Med,Vol 12,No3,pp290—292, 1991.
bility (5, 14, 18, 19). Proposed causal factors include tibiofibular sprains (16), peroneal weakness (1) and post-injury proprioceptive deficit (4, 5). The presence of a proprioceptive deficit
was suggested after a connection had been established between functional instability and an impaired ability to maintain postural control during single limb stance (5, 19).
Accepted after revision: June 26, 1990
The peroneal reflex time to sudden ankle in-
version and the postural control of 15 athletes with functionally instable ankles were compared with 15 stable controls. A trapdoor produced sudden ankle inversion. Surface electrodes recorded electromyographic activity of the peroneal muscles. Postural sway was expressed by a transverse sway value obtained during single limb stance on a force plate. Increased postural sway was found in subjects with functional instability (p < 0.01). This is in accordance with previous studies. Functionally instable subjects also displayed an increased peroneal reaction time (p
