Baylor University Doctoral Program in Physical Therapy, Waco, TX, USA.
Baylor University Doctoral Program in Physical Therapy, Waco, TX, USA.
J Electromyogr Kinesiol. 2021 Feb;56:102488. doi: 10.1016/j.jelekin.2020.102488. Epub 2020 Nov 7.
The deep posterior cervical muscles (DPCM), specifically the semispinalis cervicis and cervical multifidus, are often impaired in patients with neck disorders and have been assessed by several imaging techniques. Prior ultrasound shear wave elastography (SWE) imaging and reliability assessments of the DPCM were performed utilizing similar positioning as assessments for the more superficial cervical extensors. Our objectives were to describe an SWE imaging technique for the DPCM, establish intra-rater reliability of DPCM SWE, and compare DPCM shear modulus during rest and submaximal contraction in both prone and seated positions in individuals without spinal pain. In sixteen participants, the DPCM was located using B-mode ultrasound, then muscle shear modulus was assessed via SWE at both rest and with contraction against a 2-kg resistance applied at the C2 spinous process. Within-day intra-rater reliability was moderate to good (ICC = 0.70-0.88). The DPCM were stiffer during contraction than at rest in the prone position (p = 0.002), and at rest in sitting versus at rest in prone (p = 0.003). Further research is needed to assess DPCM-specific SWE in symptomatic individuals and compare DPCM shear modulus to electromyography across contraction intensities.
深部颈后肌群（DPCM），特别是头半棘肌和颈多裂肌，在颈部疾病患者中常受到损害，并已通过几种影像学技术进行了评估。先前已经使用与评估更浅层的颈伸肌相似的定位对 DPCM 进行了超声剪切波弹性成像（SWE）成像和可靠性评估。我们的目的是描述 DPCM 的 SWE 成像技术，建立 DPCM SWE 的内部评估者可靠性，并比较无脊柱疼痛个体在仰卧位和坐位时的 DPCM 剪切模量在休息和最大收缩期间的变化。在 16 名参与者中，使用 B 型超声定位 DPCM，然后通过 SWE 在休息时和在 C2 棘突处施加 2 公斤阻力进行收缩时评估肌肉剪切模量。日内内部评估者可靠性为中度至良好（ICC=0.70-0.88）。DPCM 在仰卧位时收缩时比休息时更硬（p=0.002），并且在坐位休息时比在仰卧位休息时更硬（p=0.003）。需要进一步的研究来评估有症状个体的 DPCM 特异性 SWE，并比较 DPCM 剪切模量与肌电图在收缩强度下的相关性。
