Contralateral force sense deficits are related to the presence of functional ankle instability

Abstract

Residual symptoms that often follow lateral ankle sprains can lead to functional ankle instability. Proprioceptive deficits have been identified as one factor that may contribute to the presence of functional ankle instability. Sixty participants were recruited to participate in the study. Seven questions were used to determine the presence of functional ankle instability in each participant. A point was added for each ''yes'' response to produce an index that represents an interval data scale of functional ankle instability. Contralateral force sense and active joint reposition sense were measured in all participants. Pearson product moment correlations were calculated to determine the relationship between functional ankle instability and force sense and active joint reposition sense. We found a significant relationship with force sense and functional ankle instability. Specifically, force sense variable error at both test forces (10 and 30% of maximal voluntary isometric contraction) were positively correlated to the presence of functional ankle instability, r ¼ 0.26; p 0.05 and r ¼ 0.25; p 0.05, respectively. All other force sense correlations were not statistically significant. No significant correlations were identified between active joint reposition sense and functional ankle instability. This study indicates that participants with functional ankle instability have deficits in low load force sense, but not active joint reposition sense. ß

Chronic Ankle Instability and Neural Excitability of the Lower Extremity

“…39 In addition, increased selfreported disability was associated with more errors when attempting to contract ankle-evertor muscles to match force loads at a low percentage of MVIC. 40,41 The corticospinal differences that we observed for the fibularis longus at lower stimulus intensities (100%-105% of AMT) may have been the mechanism dictating the inability of CAI patients to accurately reproduce sufficient voluntary muscle tension during submaximal contractions. The inability to generate adequate eversion muscle contractions when low percentages of maximal contraction capacity are necessary, such as during gait, may be related to the risk of multiple ankle sprains during common activities of daily living.…”

Beeinträchtigungen der sensomotorischen Kontrolle bei funktioneller Sprunggelenkinstabilität

“…Weitere Studien stellten bei Probanden mit einseitiger Instabilität im Seitenvergleich kinästhetische Defizite am instabilen Sprunggelenk fest [18,19], während Hubbard und Kaminsky [20] keine Differenzen im Seitenvergleich verifizieren konnten. Zur Untersuchung des Kraftsinns bei Patienten mit funktioneller Sprunggelenkinstabilität liegen ebenfalls nur wenige Arbeiten vor [21][22][23][24]. Diese konzentrieren sich auf Kraftreproduktionsaufgaben der Peronealmuskulatur.…”

“…Diese konzentrieren sich auf Kraftreproduktionsaufgaben der Peronealmuskulatur. Defizite konnten sowohl intraindividuell, also zwischen dem betroffenen und asymptomatischen Gelenk [21,22], als auch im Vergleich zu gesunden Kontrollprobanden [23,24] in jüngerer Vergangenheit mehrfach metaanalytisch zusammengefasst [14,[25][26][27]. Übereinstimmend wurden bei Personen mit funktioneller Sprunggelenkinstabilität Beeinträchtigungen der statischen und dynamischen posturalen Kontrolle nachgewiesen, die berichteten Effektstärken sind als klein bis moderat einzuschätzen (standardisierte Mittelwertdifferenz 0,3-0,6).…”

Noise-Enhanced Eversion Force Sense in Ankles With or Without Functional Instability

“…[11][12][13][14][15] Force sense is defined as the ability to detect tension from a muscle contraction. 11 Evidence indicates that individuals with FAI do not sense low-load eversion forces when replicating a targeted eversion muscle tension.…”

“…11 Evidence indicates that individuals with FAI do not sense low-load eversion forces when replicating a targeted eversion muscle tension. [11][12][13][14][15] This inability to adjust eversion tension adequately is also correlated with episodes of giving way at the ankle joint and perceived ankle instability. 11,13 Consequently, force sense is important to investigate because the ability of muscles, in particular foot evertors, to generate adequate tension may be the difference between maintaining joint stability and sustaining an inversion ankle sprain.…”