Article

Ground reaction force data in functional ankle instability during two cutting movements

Harokopion University of Athens, Athínai, Attica, Greece
Clinical Biomechanics (Impact Factor: 1.97). 06/2006; 21(4):405-11. DOI: 10.1016/j.clinbiomech.2005.11.010
Source: PubMed

ABSTRACT

Functional instability of the ankle joint may interfere with proper execution of quick cutting movements in sports. Previous studies have provided information regarding the ground reaction force characteristics in such movements in healthy players but no research was found in players with ankle instability. The purpose of this study was to evaluate and compare ground reaction forces in functionally unstable ankles with healthy ones during two cutting movements, the v-cut and the defensive shuffle.
Fifteen male basketball players with self reported unilateral functional instability and 17 matched controls, performed three v-cuts and three defensive shuffles on two synchronised force platforms. Both joints were tested and ground reaction forces analysed by an one-way ANOVA for independent groups to test differences between groups, and paired t-test to examine differences within affected players.
Unstable ankles, demonstrated significantly greater first vertical force peak, than contralateral unaffected joints (P < or = 0.05) and lower relative time to peak than controls (P< or = 0.05), during v-cut movement. No significant differences were seen in variables between groups during lateral shuffling.
Unstable ankles demonstrated altered patterns of ground reaction forces, with a rapid onset of high vertical force during the first millisecond post-impact, while the medial component was unchanged. Although the increased vertical forces are considered predisposing factors to repeated injury, this finding is likely a neuromuscular response making the ankle joint more stable avoiding excessive inversion forces.

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    • "). Inclusion criteria were: a past history of at least one unilateral ankle sprain which needed weight-bearing rest (Caulfried & Garrett, 2004; Dayakidis & Boudolos, 2006; Delahunt, Monaghan, & Caulfried, 2006, 2007); current episodes of ankle instability in the form of giving way, pain and/or subjective decrease of function; less than 24 points in the Spanish version of the Cumberland Ankle Instability Tool (CAIT-Sv) (Rodríguez-Fernández, 2013) to ensure the existence of CAI (De Noronha, Refshauge, Kilbreath, & Crosbie, 2007; Delahunt, O'Driscoll, & Moran, 2008). The CAIT-Sv is the Spanish cross-cultural adaptation of the Cumberland Ankle Instability Tool (CAIT). "
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    • "However, the unique structure and function of the ankle region has been the subject of some studies of ankle neuromuscular control (Konradsen et al., 1997) because ankle sprain is one of the most common sports injuries (Dubin et al., 2011). In sports competitions and exercises, lateral and cutting movements are repeated frequently (Stacoff et al., 1996; Dayakidis & Boudolos, 2006). In addition, the prolongation of exercise and competition time may be a factor in the occurrence of this injury, as shown in some studies that have reported that ankle sprains occur more frequently in the final minutes of competitions (Gutierrez et al., 2007; Kofotolis et al., 2007). "

    Full-text · Article · Nov 2014 · Scandinavian Journal of Medicine and Science in Sports
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    • "soccer, rugby, and Australian football), impact forces can be caused by the collision of the foot with the ground (Nigg & Liu, 1999). The measurement and analysis of foot-strike impact forces has traditionally been performed in laboratory-based settings, using immobile and expensive devices, such as force plates (Besier et al., 2001; Cowley et al., 2006; Dayakidis & Boudolos, 2006). This situation may be of limited value as it is difficult to replicate in-field environmental conditions in a laboratory setting (Wixted & Billing, 2010; Zheng et al., 2008), which may result in an inadequate understanding of the field-based demands imposed on athletes. "
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