scholarly journals Muscle Synergies in People With Chronic Ankle Instability During Anticipated and Unanticipated Cutting Tasks

2021 ◽  
Author(s):  
Hoon Kim ◽  
Riann Palmieri-Smith ◽  
Kristof Kipp
Keyword(s):  
Tibialis Anterior ◽  
Ankle Instability ◽  
Neuromuscular Control ◽  
Chronic Ankle Instability ◽  
Medial Gastrocnemius ◽  
Muscle Synergies ◽  
Healthy Controls ◽  
Joint Stability ◽  
Cross Sectional ◽  
Weighting Coefficients

Abstract Context: Although neuromuscular deficits in people with chronic ankle instability (CAI) have been identified, previous studies mostly investigated the activation of multiple muscles in isolation. Investigating muscle synergies in people with CAI would provide information about the coordination and control of neuromuscular activation strategies and could hold important information for understanding and rehabilitating neuromuscular deficits in this population. Objective: The purpose of this study was to investigate muscle synergies in people with CAI and healthy controls as they perform different cutting tasks. Design: Cross-sectional study Setting: Laboratory Participants: Eleven people with CAI (22 ± 3 years, 1.68 ± 0.11 m, 69.0 ± 19.1 kg) and 11 healthy controls (CON) (23 ± 4 years, 1.74 ± 0.11 m, 66.8 ± 15.5 kg) participated in the current study. Main Outcome Measures: Muscle synergies were extracted from the EMG of the soleus, medial gastrocnemius, lateral gastrocnemius, tibialis anterior, and fibularis longus muscles during anticipated and unanticipated cutting tasks. The number of synergies, activation coefficients, and muscle-specific weighting coefficients were compared between groups and across tasks. Results: The number of muscle synergies were the same for each group and task. The CAI group exhibited significantly greater (p = 0.023) tibialis anterior weighting coefficients within Synergy 1 compared to the CON group. In addition, both groups exhibited greater fibularis longus (p = 0.029) weighting coefficients within Synergy 2 during unanticipated cutting compared to anticipated cutting. Conclusion: These results suggest that while both groups used a neuromuscular control strategy of similar complexity / dimensionality to perform the cutting tasks, people with CAI exhibited different muscle-specific weightings characterized by greater emphasis on tibialis anterior function within Synergy 1, which may reflect an effort to increase joint stability to compensate for the presence of ankle instability.

Attentional Demands of Postural Control in Chronic Ankle Instability, Copers and Healthy Controls: A Controlled Cross-sectional Study

2020 ◽  
Vol 79 ◽  
pp. 183-188
Author(s):  
Somayeh Mohamadi ◽  
Ismail Ebrahimi ◽  
Mahyar Salavati ◽  
Mehdi Dadgoo ◽  
Amir Salar Jafarpisheh ◽  
...  
Keyword(s):  
Postural Control ◽  
Ankle Instability ◽  
Cross Sectional Study ◽  
Chronic Ankle Instability ◽  
Healthy Controls ◽  
Sectional Study ◽  
Cross Sectional ◽  
Attentional Demands

scholarly journals People with chronic ankle instability benefit from brace application in highly dynamic change of direction movements

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Patrick Fuerst ◽  
Albert Gollhofer ◽  
Markus Wenning ◽  
Dominic Gehring
Keyword(s):  
Ankle Joint ◽  
Repeated Measures ◽  
Ankle Instability ◽  
Dynamic Change ◽  
Chronic Ankle Instability ◽  
Mechanical Resistance ◽  
Healthy Controls ◽  
Neuromuscular Activation ◽  
Ankle Inversion ◽  
Ankle Brace

Abstract Background The application of ankle braces is an effective method for the prevention of recurrent ankle sprains. It has been proposed that the reduction of injury rates is based on the mechanical stiffness of the brace and on beneficial effects on proprioception and neuromuscular activation. Yet, how the neuromuscular system responds to the application of various types of ankle braces during highly dynamic injury-relevant movements is not well understood. Enhanced stability of the ankle joint seems especially important for people with chronic ankle instability. We therefore aimed to analyse the effects of a soft and a semi-rigid ankle brace on the execution of highly dynamic 180° turning movements in participants with and without chronic ankle instability. Methods Fifteen participants with functional ankle instability, 15 participants with functional and mechanical ankle instability and 15 healthy controls performed 180° turning movements in reaction to light signals in a cross-sectional descriptive laboratory study. Ankle joint kinematics and kinetics as well as neuromuscular activation of muscles surrounding the ankle joint were determined. Two-way repeated measures analyses of variance and post-hoc t-tests were calculated. Results Maximum ankle inversion angles and velocities were significantly reduced with the semi-rigid brace in comparison to the conditions without a brace and with the soft brace (p ≤ 0.006, d ≥ 0.303). Effect sizes of these reductions were larger in participants with chronic ankle instability than in healthy controls. Furthermore, peroneal activation levels decreased significantly with the semi-rigid brace in the 100 ms before and after ground contact. No statistically significant brace by group effects were found. Conclusions Based on these findings, we argue that people with ankle instability in particular seem to benefit from a semi-rigid ankle brace, which allows them to keep ankle inversion angles in a range that is comparable to values of healthy people. Lower ankle inversion angles and velocities with a semi-rigid brace may explain reduced injury incidences with brace application. The lack of effect of the soft brace indicates that the primary mechanism behind the reduction of inversion angles and velocities is the mechanical resistance of the brace in the frontal plane.

scholarly journals PREVALENSI KEJADIAN CHRONIC ANKLE INSTABILITY PADA ATLET BASKET SMA DI KABUPATEN BADUNG

2020 ◽  
Vol 8 (1) ◽  
pp. 11
Author(s):  
Vimala Krishna Prasada ◽  
Ni Wayan Tianing ◽  
Putu Ayu Sita Saraswati ◽  
I Wayan Gede Sutadarma
Keyword(s):  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Cross Sectional ◽  
Purposive Sampling ◽  
Sprain Ankle ◽  
Cumberland Ankle Instability Tool

Cedera pergelangan kaki (ankle) merupakan cedera yang paling sering dialami oleh atlet basket, dan sprain pada ligamen bagian lateral merupakan diagnosis yang paling umum. Hal tersebut dapat menyebabkan seorang atlet mengalami chronic ankle instability (CAI). Kondisi ini ditandai dengan adanya cedera berulang dan perasaan goyang pada pergelangan kaki. Tujuan dari penelitian ini adalah untuk mengetahui prevalensi kejadian chronic ankle instability pada atlet basket SMA di Kabupaten Badung. Penelitian ini merupakan penelitian deskriptif cross-sectional yang dilakukan pada bulan Maret hingga Mei 2019. Pengambilan sampel menggunakan teknik purposive sampling dengan jumlah sampel sebanyak 162 orang. Kuisioner Cumberland Ankle Instability Tool digunakan untuk menentukan responden yang mengalami CAI. Faktor lain seperti jenis kelamin, indeks massa tubuh (IMT), riwayat cedera sprain ankle,  dan ada atau tidaknya perawatan medis pasca cedera sprain ankle juga dicatat pada penelitian ini. Hasil penelitian menunjukan prevalensi kejadian chronic ankle instability sebanyak 51,2%. Responden dengan jenis kelamin laki-laki, IMT overweight, memiliki riwayat sprain ankle dan memperoleh penanganan medis pasca mengalami cedera sprain ankle memiliki kecenderungan yang lebih besar untuk mengalami CAI. Kata Kunci: Chronic Ankle Instability, Atlet Basket SMA

Relationships between mechanical joint stability and somatosensory function in individuals with chronic ankle instability

The Foot ◽  
2016 ◽  
Vol 28 ◽  
pp. 1-6 ◽  
Author(s):  
Jessica L. Kirby ◽  
Megan N. Houston ◽  
Michael L. Gabriner ◽  
Matthew C. Hoch
Keyword(s):  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Joint Stability ◽  
Mechanical Joint ◽  
Somatosensory Function

Performance Differences Between the Modified Star Excursion Balance Test and the Y-Balance Test in Individuals With Chronic Ankle Instability

2020 ◽  
Vol 29 (6) ◽  
pp. 748-753
Author(s):  
Jupil Ko ◽  
Erik Wikstrom ◽  
Yumeng Li ◽  
Michelle Weber ◽  
Cathleen N. Brown
Keyword(s):  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Balance Test ◽  
Cross Sectional ◽  
Performance Differences ◽  
Movement Strategy ◽  
History Of ◽  
Star Excursion Balance Test ◽  
Dynamic Postural Stability ◽  
Cumberland Ankle Instability Tool

Context: The modified Star Excursion Balance Test (mSEBT) and Y-Balance Test (YBT) are common dynamic postural stability assessments for individuals with chronic ankle instability (CAI). However, the reach distance measurement technique and movement strategy used during the mSEBT and YBT differ. To date, no studies have compared task performance differences on these tests in CAI patients. Objective: To determine whether individuals with CAI perform the mSEBT and YBT differently. Design: Cross-sectional. Setting: Biomechanics laboratory. Participants: Of 97 consented participants, 86 (43 females, 43 males; age 21.5 [3.3] y, height 169.8 [10.3] cm, mass 69.5 [13.4] kg), who reported ≤25 on the Cumberland Ankle Instability Tool, ≥11 on the Identification of Functional Ankle Instability, and had a history of a moderate to severe ankle sprain(s) participated. Interventions: Participants were instructed to perform the mSEBT and YBT in a predetermined counterbalanced order. Three anterior, posteromedial, and posterolateral trials of each test were completed on the involved limb after 4 practice trials. Test direction order was randomized for each participant. Main Outcome Measures: Normalized (expressed in percentage) reach distance in each direction. Paired sample t tests were performed to compare each of the 3 directions between the mSEBT and YBT. Results: Significantly shorter reach distances in the anterior (58.9% [5.8%] vs 61.4% [5.4%], P = .001) and the posteromedial (98.8% [8.6%] vs 100.8% [8.1%], P = .003) directions were noted on the mSEBT relative to the YBT. No differences in the posterolateral directions were observed. Conclusions: Within those with CAI, mSEBT and YBT normalized reach distances differ in the anterior and posteriomedial directions. As a result, clinicians and researchers should not directly compare the results of these tests.

The Arterial Anatomy of the Deltoid Ligament: A Cadaveric Study

2017 ◽  
Vol 38 (7) ◽  
pp. 785-790 ◽  
Author(s):  
Jacob A. Haynes ◽  
Michelle Gosselin ◽  
Brian Cusworth ◽  
Jeremy McCormick ◽  
Jeffrey Johnson ◽  
...  
Keyword(s):  
Operative Treatment ◽  
Tibialis Anterior ◽  
Ankle Instability ◽  
Chronic Ankle Instability ◽  
Vascular Supply ◽  
Tibialis Posterior ◽  
Deltoid Ligament ◽  
Medial Malleolus ◽  
Ankle Sprains ◽  
India Ink

Background: There is an increasing interest in the operative treatment of deltoid ligament disruption in the setting of chronic ankle instability. Understanding the vascular anatomy of the deltoid complex is beneficial when considering operative procedures on the medial ankle and may provide insight into factors that lead to chronic deltoid insufficiency and ankle instability. Methods: Thirty-two pairs of cadaveric specimens (64 total legs) were amputated below the knee, and the tibialis anterior, tibialis posterior, and peroneal arteries were injected with India ink and Ward’s blue latex. Specimens then underwent chemical debridement to identify the vascular supply to the deltoid ligament. A subset of specimens also underwent intraosseous debridement using the modified Spalteholz technique. Results: The vascular supply to the deltoid ligament was clearly visualized in 60 (93.8%) specimens. Fifty-eight specimens (96.7%) had arterial supply with an origin from the medial tarsal artery, 57 specimens (95%) had supply from the tibialis posterior artery, and 23 (38.3%) specimens had supply from the tibialis anterior artery. All specimens had at least 1 location of intraosseous vascular supply, either at the medial malleolus or medial talus. Conclusion: There were 3 separate extraosseous sources and 2 intraosseous sources of vascular supply to the deltoid ligament. Clinical Relevance: Knowledge of the vascular supply may aid in identifying factors that predispose a subset of patients with medial ankle sprains to failure of conservative treatment, as well as provide useful anatomic information when considering operative treatment for chronic ankle instability.

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