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Nine muscles are involved in arm movements. Two of these, the pectoralis major and latissimus dorsi, originate from the axial skeleton and are called axial muscles. The other seven originate from the scapula and are called the scapular muscles.
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Related Experiment Video

Updated: Sep 6, 2025

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Does the Suprascapular Nerve Move within the Suprascapular Notch? Biomechanical Perspective Using the Finite Element

Yon-Sik Yoo1, Seong-Wook Jang2, Yoon Sang Kim3

  • 1Camp 9 Orthopedic Clinic, Hwaseong, Korea.

Yonsei Medical Journal
|June 24, 2022
PubMed
Summary

The suprascapular nerve (SSN) shifts within the shoulder notch during abduction, initially contacting the transverse scapular ligament (TSL) then moving to the notch base. This movement pattern may inform TSL release for SSN entrapment.

Keywords:
Suprascapular nerve entrapmentfinite element analysisscapular movementtransverse scapular ligament decompression

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Neuroanatomy

Background:

  • Suprascapular nerve (SSN) dysfunction can cause shoulder pain and weakness.
  • Understanding the SSN's biomechanics within the suprascapular notch is crucial for diagnosing and treating entrapment syndromes.
  • The transverse scapular ligament (TSL) plays a role in SSN positioning, but its dynamic interaction during shoulder movement requires further investigation.

Purpose of the Study:

  • To analyze the dynamic changes in suprascapular nerve (SSN) position within the suprascapular notch during shoulder abduction.
  • To evaluate the contact stress on the SSN during abduction in the presence and absence of the transverse scapular ligament (TSL).

Main Methods:

  • Construction of 3D shoulder models using brachial plexus magnetic resonance imaging (BP-MR) and computed tomography (CT) data.
  • Simulation of shoulder abduction using finite element analysis to assess SSN movement and contact stress.
  • Comparison of SSN contact stress with and without the TSL.

Main Results:

  • The SSN initially contacts the anterior-inferior border of the TSL in the neutral position.
  • As shoulder abduction progresses, SSN contact stress with the TSL decreases.
  • Towards the end of abduction, SSN contact stress increases due to contact with the base of the suprascapular notch, irrespective of the TSL.

Conclusions:

  • The SSN's path within the suprascapular notch changes dynamically during shoulder abduction.
  • Initial contact with the TSL and subsequent movement towards the notch base are key findings.
  • These biomechanical insights may support surgical release of the TSL for treating SSN entrapment.