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Related Experiment Video

Updated: Nov 27, 2025

Reverse Total Shoulder Arthroplasty

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

Offset in Reverse Shoulder Arthroplasty: Where, When, and How Much.

Melissa A Wright¹, Anand M Murthi

¹From the Shoulder and Elbow Service, Department of Orthopaedics, MedStar Union Memorial Hospital, Baltimore, MD.

The Journal of the American Academy of Orthopaedic Surgeons

|December 2, 2020

Summary

This summary is machine-generated.

Modifications to reverse shoulder prosthesis, like glenosphere or humeral lateralization, aim to reduce complications. Surgeons must weigh the risks and benefits of each implant option for patient-specific treatment.

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Area of Science:

Orthopedic Surgery
Biomedical Engineering
Implant Design

Background:

The Grammont reverse shoulder prosthesis (1980s) offered a solution for rotator cuff-deficient shoulders.
Complications include scapular notching, instability, and limited motion.
Implant modifications seek to mitigate these issues.

Purpose of the Study:

To evaluate the impact of glenosphere and humeral lateralization on reverse shoulder prosthesis outcomes.
To analyze the trade-offs between improved function and potential complications.

Main Methods:

Review of implant design modifications focusing on lateralization.
Analysis of biomechanical principles and clinical implications of glenosphere vs. humeral offset.

Main Results:

Glenosphere lateralization may reduce notching and improve motion but risks baseplate loosening and acromial fracture.
Humeral lateralization can decrease notching and improve motion without increasing baseplate loosening risk, but offers limited stability benefits.

Conclusions:

Both glenosphere and humeral lateralization present distinct advantages and disadvantages.
Surgeons need thorough understanding of implant options to balance risks and benefits for individual patients.