Chinese Journal of Rehabilitation Theory and Practice ›› 2022, Vol. 28 ›› Issue (12): 1478-1483.doi: 10.3969/j.issn.1006-9771.2022.12.014

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Application of surface electromyography in motor function evaluation of patients after elbow fracture surgery

ZHI Wenqian,HUANG Qiang(),LI Qiang,LI Yanchao,WANG Yuzhang,YANG Ming,LIU Xiaohua   

  1. Beijing Jishuitan Hospital, Beijing 100035, China
  • Received:2022-06-27 Revised:2022-08-24 Online:2022-12-25 Published:2023-01-10
  • Contact: HUANG Qiang E-mail:hq2349@vip.sina.com
  • Supported by:
    Beijing Jishuitan Hospital Youth Fund(QN-202221)

Abstract:

Objective To investigate the features of surface electromyography (sEMG) signals of elbow and shoulder muscle groups during maximal isometric contraction of elbow joint, and flexion and extension exercises of elbow joint after elbow fracture surgery.

Methods From August, 2021 to April, 2022, 15 convalescent patients after elbow fracture surgery (patient group) and 11 healthy controls (control group) were collected. sEMG signals of biceps brachii, triceps brachii, brachioradialis brachii, upper trapezius, anterior deltoid, middle deltoid and posterior deltoid were recorded during maximal isometric contraction, and flexion and extension exercises of the elbow joint. Root mean square (RMS) value, co-synergy contraction ratio (CSR), co-activation radio (CR), and target muscle activation percentage during flexion and extension were calculated.

Results In flexion and extension of elbow joint during maximal isometric contraction, the maximum strength of biceps brachii and triceps brachii were lower in the patient group than in the control group (|t| > 4.109, P < 0.01), and the RMS value of triceps brachii was lower in the patient group than in the control group (t = -7.695, P < 0.001). During maximal isometric extension of elbow joint, the CR of biceps brachii and brachioradialis brachii were more in the the patient group than in the control group (t> 2.326, P < 0.05); during maximal isometric flexion of elbow joint, the CSR of upper trapezius was more in the patient group than in the control group (t = 2.232, P< 0.05). During the extension exercise, the activation level of triceps brachii was more in the patient group than in the control group (t = 3.336, P < 0.05); during flexion exercise, the activation level of biceps brachii and triceps brachii was more in the patient group than in the control group (t >2.339, P < 0.05).

Conclusion There is abnormal contraction pattern of elbow and shoulder muscle groups in patients with elbow fracture after operation, which includes obvious co-contraction pattern of elbow flexor muscle group, insufficient activation of elbow extensor muscle and the compensatory contraction pattern of perishoulder muscle group. sEMG has great potential in quantitative evaluation of motor function after elbow fracture.

Key words: elbow fracture, post-traumatic elbow stiffness, surface electromyography, root mean square, co-contraction ratio

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