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Purpose <p>The literature lacks evidence of anterior temporalis and masseter muscle activity in postoperative subjects with temporomandibular joint (TMJ) ankylosis. The goal of this study was to compare the electromyography (EMG) activity of the masseter and anterior temporalis in operated cases of TMJ ankylosis patients with the contralateral side of the same patient and with that of a normal individual.</p> Methods <p>A cross-sectional study was conducted among TMJ ankylosis patients treated with interpositional gap arthroplasty in our department from 2011 to 2018. The muscle activity of the anterior temporalis and masseter was evaluated. The study sample (Group A) included 30 patients with unilateral TMJ ankylosis who had undergone surgery. The control groups were the contralateral side of the same patient (Group B) and the normal individual (Group C). The amplitude of the temporalis and masseter was recorded while measuring the maximum bite force on the bite force device and during chewing of chewing gum. The normality of variables was assessed using the Shapiro–Wilk test. A <i>t</i> test was used to analyze the data.</p> Results <p>Group A and Group B had 14 males and 16 females with a mean age of 18.9 ± 8.6&#xa0;years. Group C also had 30 normal individuals (14 males and 16 females) with a mean age of 19.3 ± 7.9&#xa0;years. The mean duration of ankylosis was 7.5 ± 6.2&#xa0;years (3–25&#xa0;years). The amplitude of the temporalis on the ankylosed side (Group A) was 34.5% (<i>p</i> = <b>0.004</b>**) less as compared to normal individual (Group C), while it was 45.8% (<i>p</i> = <b>0.001</b>**) less from the contralateral side (Group B) while clenching. The amplitude of the masseter on the ankylosed side (Group A) was 23.8% (<i>p</i> = <b>0.019</b>*) less as compared to normal individual (Group C), while it was 37.0% (<i>p</i> = <b>0.002</b>*) less from the contralateral side while clenching (Group B). The amplitude of the temporalis on the ankylosed side (Group A) was 25.3% (<i>p</i> = <b>0.032</b>*) less as compared to normal individual (Group C), while it was 53.6% (<i>p</i> = <b>0.001</b>**) less from the contralateral side (Group B) while chewing. The amplitude of the masseter on the ankylosed side (Group A) was 12.1% (<i>p</i> = <b>0.08</b>) less as compared to normal individual (Group C) and 30.6% (<i>p</i> = <b>0.002</b>*) less from the contralateral side while chewing (Group B).</p> Conclusion <p>The present study concludes that TMJ ankylosis severely affects the temporalis and masseter muscles due to disuse atrophy. Disuse atrophy continues even after the muscles are put back to work.</p>

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Electromyographic Analysis of Anterior Temporalis and Masseter Muscles After Surgery Compared to Non-operated Joints and Normal Subjects

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Ejaz Ahmad Mokhtar,
  • Naqoosh Haidry,
  • Shivendra Choudhary,
  • Neeraj Balani,
  • Muneeb Mubashir,
  • Peeyush Shivhare

摘要

Purpose

The literature lacks evidence of anterior temporalis and masseter muscle activity in postoperative subjects with temporomandibular joint (TMJ) ankylosis. The goal of this study was to compare the electromyography (EMG) activity of the masseter and anterior temporalis in operated cases of TMJ ankylosis patients with the contralateral side of the same patient and with that of a normal individual.

Methods

A cross-sectional study was conducted among TMJ ankylosis patients treated with interpositional gap arthroplasty in our department from 2011 to 2018. The muscle activity of the anterior temporalis and masseter was evaluated. The study sample (Group A) included 30 patients with unilateral TMJ ankylosis who had undergone surgery. The control groups were the contralateral side of the same patient (Group B) and the normal individual (Group C). The amplitude of the temporalis and masseter was recorded while measuring the maximum bite force on the bite force device and during chewing of chewing gum. The normality of variables was assessed using the Shapiro–Wilk test. A t test was used to analyze the data.

Results

Group A and Group B had 14 males and 16 females with a mean age of 18.9 ± 8.6 years. Group C also had 30 normal individuals (14 males and 16 females) with a mean age of 19.3 ± 7.9 years. The mean duration of ankylosis was 7.5 ± 6.2 years (3–25 years). The amplitude of the temporalis on the ankylosed side (Group A) was 34.5% (p = 0.004**) less as compared to normal individual (Group C), while it was 45.8% (p = 0.001**) less from the contralateral side (Group B) while clenching. The amplitude of the masseter on the ankylosed side (Group A) was 23.8% (p = 0.019*) less as compared to normal individual (Group C), while it was 37.0% (p = 0.002*) less from the contralateral side while clenching (Group B). The amplitude of the temporalis on the ankylosed side (Group A) was 25.3% (p = 0.032*) less as compared to normal individual (Group C), while it was 53.6% (p = 0.001**) less from the contralateral side (Group B) while chewing. The amplitude of the masseter on the ankylosed side (Group A) was 12.1% (p = 0.08) less as compared to normal individual (Group C) and 30.6% (p = 0.002*) less from the contralateral side while chewing (Group B).

Conclusion

The present study concludes that TMJ ankylosis severely affects the temporalis and masseter muscles due to disuse atrophy. Disuse atrophy continues even after the muscles are put back to work.