Department of Oral & Maxillofacial Surgery, All India Institute of Medical Sciences, New Delhi, India.
Department of Oral & Maxillofacial Surgery, All India Institute of Medical Sciences, New Delhi, India.
Br J Oral Maxillofac Surg. 2022 Sep;60(7):896-903. doi: 10.1016/j.bjoms.2022.01.009. Epub 2022 Feb 2.
The purpose of the study was to evaluate the longitudinal changes in electromyographic (EMG) activity of the masseter and temporalis muscles before and after temporomandibular joint (TMJ) total joint replacement (TJR) in ankylosis patients. A prospective longitudinal study was designed on patients undergoing unilateral or bilateral TMJ-TJR. EMG activity at rest and maximal voluntary contraction (MVC) was recorded for the muscles preoperatively (T0), and at one-week (T1) and six-month (T2) follow up. The study sample was composed of 10 (male: female 2.3:1) patients undergoing TMJ-TJR. The number of unilateral and bilateral cases was three and seven, respectively. In both unilateral and bilateral cases a statistically significant reduction in EMG activity of the masseter and anterior temporalis muscles was observed at T1. At T2, EMG activity of the muscles was found to be approaching the preoperative value. In unilateral cases, when the affected side at T0, T1, and T2 was compared with T0 for the unaffected side, statistically significant differences were seen for the masseter. In the case of the temporalis, similar results were seen except at T2 for the postural rest position. The results indicate that re-attachment of the masseter and temporalis muscles occurs progressively post TMJ-TJR.
本研究旨在评估颞下颌关节（TMJ）全关节置换（TJR）前后咀嚼肌和颞肌肌电图（EMG）活动的纵向变化。设计了一项对接受单侧或双侧 TMJ-TJR 的患者进行的前瞻性纵向研究。在术前（T0）、术后 1 周（T1）和 6 个月（T2）时记录肌肉的静息和最大自主收缩（MVC）时的 EMG 活动。研究样本由 10 名（男女 2.3:1）接受 TMJ-TJR 的患者组成。单侧和双侧的病例数分别为 3 例和 7 例。在单侧和双侧病例中，T1 时观察到咀嚼肌和前颞肌的 EMG 活动明显减少。在 T2 时，肌肉的 EMG 活动被发现接近术前值。在单侧病例中，当比较 T0、T1 和 T2 时，受累侧与未受累侧相比，咀嚼肌的差异具有统计学意义。在颞肌方面，除了 T2 时的姿势静息位外，也观察到了类似的结果。结果表明，TMJ-TJR 后，咀嚼肌和颞肌逐渐重新附着。
