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Related Experiment Video

Updated: Jun 5, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

Instability after reverse total shoulder replacement.

Robert A Gallo1, Seth C Gamradt, Christopher J Mattern

  • 1Bone and Joint Institute, Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine, Hershey, PA, USA.

Journal of Shoulder and Elbow Surgery
|December 21, 2010
PubMed
Summary
This summary is machine-generated.

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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...

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Instability after reverse total shoulder arthroplasty is a significant complication, often linked to soft tissue issues, implant malpositioning, or infection. Outcomes for treating early instability are frequently poor, highlighting the need for careful surgical technique.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Musculoskeletal Research

Background:

  • Instability is a persistent challenge following reverse total shoulder arthroplasty (RTSA).
  • Advances in surgical techniques and implant design have not fully resolved this complication.

Purpose of the Study:

  • To investigate the incidence and causes of early postoperative instability after RTSA.
  • To evaluate the outcomes of managing instability in RTSA patients.

Main Methods:

  • Retrospective review of the first 57 RTSAs performed between 2004 and 2006.
  • Analysis of patient records for cases of instability within the first 6 months post-surgery.

Main Results:

  • Nine cases of instability were identified, all occurring within 6 months.

Related Experiment Videos

Last Updated: Jun 5, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

  • Instability was associated with subscapularis tendon compromise, superiorly inclined or positioned metaglenes, and infection.
  • Poor outcomes were observed, with many patients requiring revision surgery, explantation, or experiencing chronic instability.

    • Conclusions:

    • Early RTSA instability is multifactorial, involving soft tissue integrity, deltoid tension, implant placement, and infection.
    • Treatment outcomes for early instability following RTSA are generally unfavorable.