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Related Concept Videos

Muscles of the Shoulder01:23

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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.
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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.
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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Updated: Jan 8, 2026

Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft
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Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft

Published on: June 6, 2025

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Increased Deltoid Muscle Volume After Scope-Assisted Lower Trapezius Tendon Transfer.

Chang Hee Baek1, Jean Kany2, Bassem T Elhassan3

  • 1Department of Orthopaedic Surgery, Yeosu Baek Hospital, Yeosu, Republic of Korea.

Orthopaedic Journal of Sports Medicine
|December 19, 2025
PubMed
Summary
This summary is machine-generated.

Scope-assisted lower trapezius tendon transfer (SALTT) increases deltoid muscle volume (DMV), leading to improved shoulder strength and function after rotator cuff repair. This study shows a correlation between increased DMV and better clinical outcomes post-SALTT.

Keywords:
deltoid musclelower trapezius tendon transfermuscle strengthposterosuperior irreparable rotator tears

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Area of Science:

  • Orthopedic Surgery
  • Shoulder Reconstruction
  • Rotator Cuff Repair

Background:

  • Scope-assisted lower trapezius tendon transfer (SALTT) is a treatment for irreparable rotator cuff tears.
  • Limited research exists on deltoid muscle volume (DMV) changes and strength recovery post-SALTT.

Purpose of the Study:

  • To evaluate deltoid muscle volume (DMV) changes after SALTT.
  • To assess the impact of DMV changes on clinical outcomes and muscle strength.

Main Methods:

  • Retrospective analysis of 54 patients undergoing SALTT for posterosuperior irreparable rotator cuff tears (PSIRCTs).
  • 3D deltoid muscle models generated from MRI scans to calculate volume (DMV).
  • Clinical assessments included pain, PROMs, active range of motion (aROM), and muscle strength.

Main Results:

  • Postoperative clinical outcomes significantly improved after SALTT.
  • A significant increase in body mass index-adjusted deltoid muscle volume (aDMV) was observed.
  • Higher postoperative aDMV and greater increases in aDMV (ΔaDMV) correlated with better clinical outcomes and strength, especially in patients with intact grafts.

Conclusions:

  • Postoperative aDMV increase after SALTT is associated with improved clinical outcomes, including PROMs, aROM, and strength.
  • The findings elucidate the mechanism of strength recovery post-SALTT, highlighting the role of increased DMV.