Can the Rhomboid Major Muscle Be Used to Identify the Thoracic Spinal Segment on Ultrasonography? A Prospective Observational Study

Author:

Jung Haesun12,Bae Junyeol23,Kim Jungsoo24,Yoo Yongjae5,Lee Ho-Jin5,Rho Hyungsang5,Han Andrew Hogyu6,Moon Jee Youn25ORCID

Affiliation:

1. Department of Anesthesiology and Pain Medicine, Chung-Ang University Hospital , Seoul, Republic of Korea

2. Department of Anesthesiology and Pain Medicine, Seoul National University College of Medicine , Seoul, Republic of Korea

3. Department of Anesthesiology and Pain Medicine, Uijeongbu Eulji University Hospital , Gyeonggi-do, Republic of Korea

4. Department of Anesthesiology and Pain Medicine, Boramae Medical Center , Seoul, Republic of Korea

5. Department of Anesthesiology and Pain Medicine, Seoul National University Hospital , Seoul, Republic of Korea

6. Georgetown University School of Medicine , Washington, DC, USA

Abstract

Abstract Objective We investigated the thoracic segment corresponding to the inferior margin of the rhomboid major muscle (RMM) using ultrasound (US) to evaluate its potential as a reliable anatomic landmark for segment identification. Design A prospective observational study. Setting An operating room. Subjects Patients who underwent procedures around the thoracic spine. Methods Four hundred segments corresponding to the RMM’s inferior margin were identified through the use of paravertebral sagittal US and confirmed by fluoroscopy in 100 participants in the prone position with upward and downward shoulder rotation, comprising four datasets (up-right, up-left, down-right, and down-left). The US identification of the RMM’s inferior margin was dichotomously scored (clear vs ambiguous). Each dataset was divided into two groups (dominant segment group vs remaining segments group), which were compared. Factors relevant to the dominant segment associated with the RMM’s inferior border were determined through univariable analyses. Results The T6 segment was observed most commonly (59.5%) along the RMM’s inferior border on paravertebral sagittal US acquired in the prone position, followed by T5 (25.0%), T7 (12.8%), and T4 (2.7%). The segments corresponding to the RMM remained unchanged by shoulder posture in most participants (n = 74, 74%). The RMM’s inferior border was clearly distinguishable in 330 cases (82.5%). When the RMM’s inferior border was clearly identified, the corresponding segment was likely to match T6 in all datasets, with odds ratios ranging from 3.24 to 6.2. Conclusions The RMM’s inferior border over the transverse process corresponded to T6 most frequently on paravertebral sagittal US, and its deep fascia was clearly visible in most cases.

Funder

Hyundae Pharm, Ltd.

Seoul, Republic of Korea

Publisher

Oxford University Press (OUP)

Subject

Anesthesiology and Pain Medicine,Neurology (clinical),General Medicine

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4. Effect of repeated paravertebral injections with local anesthetics and steroids on prevention of post-herpetic neuralgia pain physician;Makharita;Anesth Analg,2020

5. Multicenter longitudinal cross-sectional study comparing effectiveness of serratus anterior plane, paravertebral and thoracic epidural for the analgesia of multiple rib fractures;Beard;Reg Anesth Pain Med,2020

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