Change in Electromyographic Activity of Wrist Extensor by Cylindrical Brace

Yoon, Jung Joong; Bae, Hasuk

doi:10.3349/ymj.2013.54.1.220

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…However, investigations of a variety of knee and ankle orthoses in ligamentous injuries have shown conflicting results, with some studies indicating enhanced proprioception with orthoses 59 and others suggesting no effect. 5,7 Orthoses have also been reported to increase confidence, 6,61 enhance neuromuscular control, 31,49,60 and modulate pain 25 in other clinical settings. Again, there is some conflicting evidence on these effects and their magnitude.…”

Section: Discussionmentioning

confidence: 99%

The Effectiveness of a Hinged Elbow Orthosis in Medial Collateral Ligament Injuries: An In Vitro Biomechanical Study

2019

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Background: Medial collateral ligament (MCL) injuries are common after elbow trauma and in overhead throwing athletes. A hinged elbow orthosis (HEO) is often used to protect the elbow from valgus stress early after injury and during early return to play. However, there is minimal evidence regarding the efficacy of these orthoses in controlling instability and their influence on long-term clinical outcomes. Purpose: (1) To quantify the effect of an HEO on elbow stability after simulated MCL injury. (2) To determine whether arm position, forearm rotation, and muscle activation influence the effectiveness of an HEO. Study Design: Controlled laboratory study. Methods: Seven cadaveric upper extremity specimens were tested in a custom simulator that enabled elbow motion via computer-controlled actuators and motors attached to relevant tendons. Specimens were examined in 2 arm positions (dependent, valgus) and 2 forearm positions (pronation, supination) during passive and simulated active elbow flexion while unbraced and then while braced with an HEO. Testing was performed in intact elbows and repeated after simulated MCL injury. An electromagnetic tracking device measured valgus angulation as an indicator of elbow stability. Results: When the arm was dependent, the HEO increased valgus angle with the forearm in pronation (+1.0°± 0.2°, P = .003) and supination (+1.5°± 0.0°, P = .006) during active motion. It had no significant effect on elbow stability during passive motion. In the valgus position, the HEO had no effect on elbow stability during passive or active motion in pronation and supination. With the arm in the valgus position with the HEO, muscle activation reduced instability during pronation (–10.3°± 2.5°, P = .006) but not supination ( P = .61). Conclusion: In this in vitro study, this HEO did not enhance mechanical stability when the arm was in the valgus and dependent positions after MCL injury. Clinical Relevance: After MCL injury, an HEO likely does not provide mechanical elbow stability during rehabilitative exercises or when the elbow is subjected to valgus stress such as occurs during throwing.

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Section: Discussionmentioning

confidence: 99%

The Effectiveness of a Hinged Elbow Orthosis in Medial Collateral Ligament Injuries: An In Vitro Biomechanical Study

2019

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“…It is related to repetitive microtrauma in the wrist extensor muscles from sports or work overuse, especially at the extensor carpi radialis brevis (ECRB) on the proximal insertion at the elbow. 9–17…”

Section: Introductionmentioning

confidence: 99%

Influence of volar and dorsal static orthoses in different wrist positions on muscle activation and grip strength in healthy subjects

et al. 2014

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Introduction Orthoses are indicated for injuries of the wrist, although there is weak evidence for its influence on extensor muscle activation patterns. The purpose of this study was to compare two designs of volar and dorsal wrist orthoses in several positions, from flexion to extension, by surface electromyography wrist extensor muscle activation and grip strength in healthy subjects. Methods We analysed extensor carpi radialis brevis and longus, extensor carpi ulnaris and extensor digitorum comunis muscle activity by surface electromyography. The volunteers performed maximum and submaximum (50%) isometric grips, which were evaluated with a Jamar™ dynamometer using volar and dorsal orthoses with several positions of the wrist (0°, 15° and 30°), both in flexion and extension (p < 0.05). Results Our results showed a significant decrease in extensor muscle activation at 15° and 30° of wrist extension in both volar and dorsal orthoses at 100% and 50% of maximum task. A decrease was also found at rest at 15° of wrist flexion volar orthoses. Decreased grip strength was found at 15° and 30° of wrist flexion in both volar and dorsal orthoses. Conclusions Based on the results of this sample, we would suggest, as orthotic prescriptions, 15° or 30° wrist extension orthoses as a supporting therapeutic modality for performance in new studies with lateral epicondylitis in association with low-intensity grip activity; or 15° of wrist flexion volar orthoses for rest, depending on the chronicity of the disease and individual assessment. Future studies with symptomatic patients are needed to confirm these findings.

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Efficacy of extension wrist hand orthosis on pain, grip strength and electromyographic activities in lateral epicondylitis: A randomized single-blind clinical trial

Sahoo¹,

Mohanty²,

Mohapatra³

et al. 2023

Journal of Hand Therapy

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Change in Electromyographic Activity of Wrist Extensor by Cylindrical Brace

Cited by 5 publications

References 25 publications

The Effectiveness of a Hinged Elbow Orthosis in Medial Collateral Ligament Injuries: An In Vitro Biomechanical Study

The Effectiveness of a Hinged Elbow Orthosis in Medial Collateral Ligament Injuries: An In Vitro Biomechanical Study

Influence of volar and dorsal static orthoses in different wrist positions on muscle activation and grip strength in healthy subjects

Efficacy of extension wrist hand orthosis on pain, grip strength and electromyographic activities in lateral epicondylitis: A randomized single-blind clinical trial

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