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Effects of Inversion Perturbation After Step-Down on the Latency of the Peroneus Longus and Peroneus Brevis

Adam C. Knight and Wendi H. Weimar

The purpose of this investigation was to determine the effect of different types of ankle sprains on the response latency of the peroneus longus and peroneus brevis to an inversion perturbation, as well as the time to complete the perturbation (time to maximum inversion). To create a forced inversion moment of the ankle, an outer sole with fulcrum was used to cause 25 degrees of inversion at the ankle upon landing from a 27 cm step-down task. Forty participants completed the study: 15 participants had no history of any ankle sprain, 15 participants had a history of a lateral ankle sprain, and 10 participants had a history of a high ankle sprain. There was not a significant difference between the injury groups for the latency measurements or the time to maximum inversion. These findings indicate that a previous lateral ankle sprain or high ankle sprain does not affect the latency of the peroneal muscles or the time to complete the inversion range of motion.

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Chronic Ankle Instability Does Not Influence Tibiofemoral Contact Forces During Drop Landings Using a Musculoskeletal Model

Yumeng Li, He Wang, and Kathy J. Simpson

evaluating ankle braces and ankle inversion perturbation? Clin J Sport Med . 2012 ; 22 : 214 – 220 . PubMed ID: 22382431 doi:10.1097/JSM.0b013e318248e5f6 22382431 10.1097/JSM.0b013e318248e5f6 27. Kulas AS , Schmitz RJ , Schultz SJ , Watson MA , Perrin DH . Energy absorption as a predictor