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Related Concept Videos

Muscles of the Shoulder01:23

Muscles of the Shoulder

The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
Muscles that Move the Arm01:31

Muscles that Move the Arm

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.
The pectoralis major has two origins. Its clavicular head originates on the medial half of the clavicle. In contrast, the sternocostal head originates on the costal cartilages of ribs 1-6, the sternum, and the aponeurosis of the external oblique of the...

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Related Experiment Video

Updated: May 12, 2026

Anterior Capsular Reconstruction with Human Dermal Allograft for Irreparable Subscapularis Tears
04:27

Anterior Capsular Reconstruction with Human Dermal Allograft for Irreparable Subscapularis Tears

Published on: May 9, 2025

39

Subscapularis atrophy and function after arthroscopic Trillat procedure.

Arnaud Gonnachon1, Bastien Michon1, Timothée Savoye-Laurens1

  • 1Service d'Orthopédie, CHU F. Mitterrand Dijon-Bourgogne, 12 Bd Maréchal de Lattre de Tassigny, 21000 Dijon, France.

Orthopaedics & Traumatology, Surgery & Research : OTSR
|July 26, 2024
PubMed
Summary

The arthroscopic Trillat procedure for shoulder instability causes minor subscapularis muscle atrophy at 6 months but no strength loss at 1 year. This contrasts with the Latarjet procedure, which often leads to persistent internal rotation weakness.

Keywords:
ArthroscopicAtrophyShoulder instabilitySubscapularisTrillat

Related Experiment Videos

Last Updated: May 12, 2026

Anterior Capsular Reconstruction with Human Dermal Allograft for Irreparable Subscapularis Tears
04:27

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Published on: May 9, 2025

39

Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Shoulder Instability Research

Background:

  • The Latarjet procedure for shoulder instability is associated with persistent internal rotation strength deficits.
  • The arthroscopic Trillat procedure offers a potential alternative by avoiding subscapularis muscle splitting.

Purpose of the Study:

  • To evaluate the impact of the arthroscopic Trillat procedure on rotator cuff muscle morphology and strength.
  • To determine if the arthroscopic Trillat procedure causes subscapularis atrophy or strength deficits.

Main Methods:

  • Retrospective study of 58 patients undergoing arthroscopic Trillat procedure for chronic anterior shoulder instability.
  • CT scans assessed rotator cuff muscle cross-sectional area (CSA) and fatty infiltration (MMA) at baseline and 6 months.
  • Isokinetic strength testing of internal and external rotators performed at 1 year post-surgery.

Main Results:

  • A significant 5.3% decrease in subscapularis muscle CSA was observed at 6 months.
  • Increased subscapularis MMA and decreased external rotator MMA indicated muscle changes.
  • No significant strength deficit in internal or external rotators was detected at the 1-year follow-up.

Conclusions:

  • The arthroscopic Trillat procedure results in minimal subscapularis muscle atrophy with no long-term strength impairment.
  • This finding suggests the arthroscopic Trillat procedure is a viable option for shoulder stabilization without compromising rotator cuff strength.