scholarly journals Neural Excitability and Joint Laxity in Chronic Ankle Instability, Coper, and Control Groups

2016 ◽  
Vol 51 (4) ◽  
pp. 336-343 ◽  
Author(s):  
Samantha Bowker ◽  
Masafumi Terada ◽  
Abbey C. Thomas ◽  
Brian G. Pietrosimone ◽  
Claire E. Hiller ◽  
...  
Keyword(s):  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Spinal Reflex ◽  
Hoffmann Reflex ◽  
Neural Excitability ◽  
Reflex Excitability ◽  
Total Displacement ◽  
Ankle Arthrometer ◽  
Healthy Control ◽  
And Control

Neuromuscular and mechanical deficiencies are commonly studied in participants with chronic ankle instability (CAI). Few investigators have attempted to comprehensively consider sensorimotor and mechanical differences among people with CAI, copers who did not present with prolonged dysfunctions after an initial ankle sprain, and a healthy control group.Context: To determine if differences exist in spinal reflex excitability and ankle laxity among participants with CAI, copers, and healthy controls.Objective: Case-control study.Design: Research laboratory.Setting: Thirty-seven participants with CAI, 30 participants categorized as copers, and 26 healthy control participants.Patients or Other Participants: We assessed spinal reflex excitability of the soleus using the Hoffmann reflex protocol. Participants' ankle laxity was measured with an instrumented ankle arthrometer. The maximum Hoffmann reflex : maximal muscle response ratio was calculated. Ankle laxity was measured as the total displacement in the anterior-posterior directions (mm) and total rotation in the inversion and eversion directions (°).Main Outcome Measure(s): Spinal reflex excitability was diminished in participants with CAI compared with copers and control participants (P = .01). No differences were observed among any of the groups for ankle laxity.Results: Changes in the spinal reflex excitability of the soleus that likely affect ankle stability were seen only in the CAI group, yet no mechanical differences were noted across the groups. These findings support the importance of finding effective ways to increase spinal reflex excitability for the purpose of treating neural excitability dysfunction in patients with CAI.Conclusion:

scholarly journals Analysis of Ankle Laxity, Self-reported Function, and Perceived Instability in Chronic Ankle Instability, Coper, and Control Groups

2021 ◽  
Vol 30 (1) ◽  
pp. 43-51
Author(s):  
Hongsuk Lee ◽  
Hyunsoo Kim ◽  
Ty Hopkins ◽  
S. Jun Son
Keyword(s):  
Ankle Instability ◽  
Pearson Correlation ◽  
Frontal Plane ◽  
Static Stability ◽  
Chronic Ankle Instability ◽  
Control Group ◽  
Control Groups ◽  
Ankle Arthrometer ◽  
Ankle Function ◽  
And Control

PURPOSE:This study aimed to identify differences in ankle laxity in chronic ankle instability (CAI), coper, and control groups, and a correlation between ankle laxity, self-reported function, and perceived instability.METHODS: Sixty-six participants (22 CAI patients, 22 copers, and 22 controls) selected by recommendations of the International Ankle Consortium volunteered for this study. Foot and Ankle Ability Measure Activities of Daily Living (FAAM-ADL), FAAM-Sports, and Ankle Instability Instrument (AII) were used to assess participants’ self-reported function and perceived instability. The FAAMADL and FAAM-Sports are reported as a percentage. Higher scores indicate better function. The AII is reported as “yes” responses while more “yes” responses indicate higher instability. Three trials of anterior/posterior (A/P) displacement and inversion/eversion (I/E) displacement were assessed by an instrumented ankle arthrometer. Greater displacement indicates higher laxity. The ankle positioned in sagittal- and frontal-plane neutral while A/P and I/E displacement were assessed with 125 N and 4 N-m, respectively. The means of three trials were used for data analysis. One-way ANOVA and Tukey post-hoc comparisons (α=0.05) were performed to identify differences in ankle laxity between groups. Pearson correlation analysis was performed to identify a relationship between ankle laxity, self-reported function, and perceived instability.RESULTS: CAI patients show greater A/P displacement compared to control group (p<.03), and greater I/E displacement compared to coper and control groups (p<.03). Several positive and negative correlations were found between ankle laxity, self-reported function, and perceived instability (p<.00).CONCLUSIONS: As self-reported function and perceived instability are correlated with greater laxity (I/E displacement), improving static stability (ankle laxity) may play an important role in improving perceived ankle function and instability in CAI.

scholarly journals Changes in Spinal and Corticospinal Excitability in Patients with Chronic Ankle Instability: A Systematic Review with Meta-Analysis

2019 ◽  
Vol 8 (7) ◽  
pp. 1037 ◽  
Author(s):  
Kyung-Min Kim ◽  
Joo-Sung Kim ◽  
David Cruz-Díaz ◽  
Seungho Ryu ◽  
Minsoo Kang ◽  
...  
Keyword(s):  
Systematic Review ◽  
Ankle Instability ◽  
Meta Analysis ◽  
Chronic Ankle Instability ◽  
H Reflex ◽  
Corticospinal Excitability ◽  
Spinal Reflex ◽  
Control Group ◽  
Neural Excitability ◽  
Ankle Muscles

The objective of this systematic review with meta-analysis was to determine alterations in spinal and corticospinal excitability of ankle muscles in patients with chronic ankle instability (CAI) compared to uninjured controls. Independent researchers performed comprehensive literature searches of electronic databases and included studies that compared groups with and without CAI and investigated neural excitability with Hoffmann reflex (H-reflex) and/or transcranial magnetic stimulation (TMS). A fixed-effect meta-analysis was conducted to determine group differences for (1) soleus and fibularis maximal H-reflex (Hmax)/maximal M-wave (Mmax)-ratios, and (2) soleus and fibularis longus cortical motor thresholds (CMTs). Seventeen studies were included in the current meta-analysis. They showed that the Hmax/Mmax-ratios of the soleus and the fibularis longus in the CAI group were significantly lower than those in the uninjured control group (soleus: d = −0.41, p < 0.001; fibularis longus: d = −0.27, p = 0.04). There was no evidence for changes in the CMT. This systematic review is the first to demonstrate evidence that patients with CAI present decreased spinal reflex excitability in the soleus and fibularis longus. However, there is no evidence of changes in supraspinal excitability when considering only the CMT. The latter result needs to be interpreted with caution as all except one study demonstrate some changes at the supraspinal level with CAI.

Fibular taping does not alter lower extremity spinal reflex excitability in individuals with chronic ankle instability

2015 ◽  
Vol 25 (2) ◽  
pp. 253-259 ◽  
Author(s):  
Terry L. Grindstaff ◽  
Michael J. Hanish ◽  
Todd J. Wheeler ◽  
Curtis R. Basnett ◽  
Daniel J. Miriovsky ◽  
...  
Keyword(s):  
Lower Extremity ◽  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Spinal Reflex ◽  
Reflex Excitability

scholarly journals Talar and Subtalar T1ρ Relaxation Times in Limbs with and without Chronic Ankle Instability

Cartilage ◽  
2021 ◽  
pp. 194760352199462
Author(s):  
Kyeongtak Song ◽  
Brian Pietrosimone ◽  
Joshua N. Tennant ◽  
Daniel B. Nissman ◽  
Katherine M. Dederer ◽  
...  
Keyword(s):  
Ankle Instability ◽  
Relaxation Times ◽  
Chronic Ankle Instability ◽  
Talar Dome ◽  
Contralateral Limb ◽  
Secondary Purpose ◽  
Healthy Control ◽  
Control Limb ◽  
Proteoglycan Content ◽  
Magnetic Resonance Imaging Mri

Objective The primary aim was to determine differences in talocrural and subtalar joint (STJ) articular cartilage composition, using T1ρ magnetic resonance imaging (MRI) relaxation times, between limbs in individuals with unilateral chronic ankle instability (CAI) and compare with an uninjured control. Our secondary purpose was to determine the association between talocrural and STJ composition in limbs with and without CAI. Design T1ρ MRI relaxation times were collected on 15 CAI (11 females, 21.13 ± 1.81 years, body mass index [BMI] = 23.96 ± 2.74 kg/m2) and 15 uninjured control individuals (11 females, 21.07 ± 2.55 years, BMI = 24.59 ± 3.44 kg/m2). Talocrural cartilage was segmented manually to identify the overall talar dome. The SJT cartilage was segmented manually to identify the anterior, medial, and posterior regions of interest consistent with STJ anatomical articulations. For each segmented area, a T1ρ relaxation time mean and variability value was calculated. Greater T1ρ relaxation times were interpreted as decreased proteoglycan content. Results Individuals with CAI demonstrated a higher involved limb talocrural T1ρ mean and variability relative to their contralateral limb ( P < 0.05) and the healthy control limb ( P < 0.05). The CAI-involved limb also had a higher posterior STJ T1ρ mean relative to the healthy control limb ( P < 0.05). In healthy controls ( P < 0.05), but not the CAI-involved or contralateral limbs (p>0.05), talocrural and posterior STJ composition measures were positively associated. Conclusions Individuals with CAI have lower proteoglycan content in both the talocrural and posterior STJ in their involved limbs relative to the contralateral and a healthy control limb. Cartilage composition findings may be consistent with the early development of posttraumatic osteoarthritis.

Prelanding movement strategies among chronic ankle instability, coper, and control subjects

2021 ◽  
pp. 1-17
Author(s):  
Seunguk Han ◽  
Seong Jun Son ◽  
Hyunsoo Kim ◽  
Hyunwook Lee ◽  
Matthew Seeley ◽  
...  
Keyword(s):  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Control Subjects ◽  
Movement Strategies ◽  
And Control

Segmental Spinal Reflex Adaptations Associated With Chronic Ankle Instability

2008 ◽  
Vol 89 (10) ◽  
pp. 1991-1995 ◽  
Author(s):  
JoEllen M. Sefton ◽  
Charlie A. Hicks-Little ◽  
Tricia J. Hubbard ◽  
Mark G. Clemens ◽  
Christopher M. Yengo ◽  
...  
Keyword(s):  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Spinal Reflex

The Immediate Effects of an Anterior-To-Posterior Talar Mobilization on Neural Excitability, Dorsiflexion Range of Motion, and Dynamic Balance in Patients With Chronic Ankle Instability

2014 ◽  
Vol 23 (4) ◽  
pp. 351-359 ◽  
Author(s):  
Matthew Harkey ◽  
Michelle McLeod ◽  
Ashley Van Scoit ◽  
Masafumi Terada ◽  
Michael Tevald ◽  
...  
Keyword(s):  
Postural Control ◽  
Range Of Motion ◽  
Outcome Measures ◽  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Corticospinal Excitability ◽  
Spinal Reflex ◽  
Control Group ◽  
Joint Mobilization ◽  
Grade Iii

Context:Altered neuromuscular function and decreased dorsiflexion range of motion (DFROM) have been observed in patients with chronic ankle instability (CAI). Joint mobilizations are indicated for restoring DFROM and dynamic postural control, yet it remains unknown if a mobilization can alter neuromuscular excitability in muscles surrounding the ankle.Objective:To determine the immediate effects of a Maitland grade III anterior-to-posterior joint mobilization on spinal-reflex and corticospinal excitability in the fibularis longus (FL) and soleus (SOL), DFROM, and dynamic postural control.Design:Single-blinded randomized control trial.Setting:Research laboratory.Patients:30 patients with CAI randomized into a mobilization (n = 15) or control (n = 15) group.Intervention:Maitland grade III anterior-to-posterior joint mobilization.Main Outcome Measures:Spinal-reflex excitability was measured with the Hoffmann reflex, while corticospinal excitability was evaluated with transcranial magnetic stimulation. DFROM was measured seated with the knee extended, and dynamic postural control was quantified with the Star Excursion Balance Test. Separate 2 × 2 repeated-measures ANOVAs were performed for each outcome measure. Dependent t tests were used to evaluate individual differences within groups in the presence of significance.Results:Spinal-reflex and corticospinal excitability of the SOL and FL were not altered in the mobilization or control group (P > .05). DFROM increased immediately after the mobilization (P = .05) but not in the control group, while dynamic postural control was unchanged in both groups (P > .05).Conclusion:A single joint-mobilization treatment was efficacious at restoring DFROM in participants with CAI; however, excitability of spinal reflex and corticospinal pathways at the ankle and dynamic postural control were unaffected.

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