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Updated: Jun 24, 2026
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Rat Model of Adhesive Capsulitis of the Shoulder
Published on: September 28, 2018
Effect of rotator cuff dysfunction on the initial mechanical stability of cementless glenoid components
Daniel R Suárez1, Edward R Valstar, Jacqueline C van der Linden
1Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University MC, Leiden, The Netherlands. d.r.suarez_venegas@lumc.nl
Medical & Biological Engineering & Computing
|March 24, 2009
Summary
Rotator cuff dysfunction significantly impacts shoulder replacement stability. Severe dysfunction, particularly involving the infraspinatus, leads to greater implant micromotions and instability, affecting patient outcomes.
Area of Science:
- Orthopedic surgery
- Biomechanical engineering
- Biomaterials science
Background:
- Shoulder replacement outcomes depend on rotator cuff function.
- Rotator cuff disease is prevalent in total shoulder arthroplasty candidates.
- Initial glenoid implant stability is crucial for successful arthroplasty.
Purpose of the Study:
- To evaluate the relationship between rotator cuff functional status and cementless glenoid implant initial stability.
- To quantify the effect of rotator cuff dysfunction on bone-implant interface micromotions using finite element analysis.
Main Methods:
- A 3D finite element model of a scapula was developed.
- Simulations included four rotator cuff conditions (intact to fully ruptured) and two bone qualities.
- Bone-implant interface micromotions were measured under physiological loading shortly after surgery.
Main Results:
- Micromotions were significantly higher with severe rotator cuff dysfunction (supraspinatus and infraspinatus fully dysfunctional).
- Bone quality significantly influenced micromotions, with poorer quality leading to larger movements.
- Isolated supraspinatus dysfunction had minimal impact, but combined infraspinatus involvement caused significant glenohumeral joint displacement and instability.
Conclusions:
- Severe rotator cuff dysfunction compromises initial cementless glenoid implant stability.
- Infraspinatus integrity is critical for maintaining glenohumeral joint alignment and implant stability.
- Preoperative assessment of rotator cuff status is essential for predicting shoulder replacement outcomes.
