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The effect of isolated labrum resection on shoulder stability
Nicole Pouliart1, Olivier Gagey
1Department of Orthopaedics and Traumatology, Academic Hospital Vrije Universiteit Brussel, Belgium. izvptn@az.vub.ac.be
Summary
Isolated glenoid labrum tears, without capsuloligamentous damage, likely do not cause shoulder dislocation. However, resecting two or more labral zones may significantly increase anterior translation.
Area of Science:
- Orthopedic Surgery
- Sports Medicine
- Anatomy
Background:
- Glenohumeral instability and dislocation are common concerns in shoulder injuries.
- The role of isolated glenoid labrum lesions in causing instability requires further clarification.
Purpose of the Study:
- To investigate if isolated glenoid labrum lesions can lead to glenohumeral instability and dislocation.
- To assess the impact of sequential labral zone resections on shoulder stability in a cadaver model.
Main Methods:
- Arthroscopic assessment of glenohumeral stability in 24 cadaver shoulders.
- Sequential resection of adjacent glenoid labrum zones (superior, anterosuperior, anteroinferior, inferior) using a motorized shaver.
- Stability testing included inferior drawer, anteroposterior drawer, and load-and-shift tests.
Main Results:
- Complete labral resection resulted in grade 1 inferior instability but no dislocation.
- Resecting two adjacent labral zones caused grade 2 anterior instability in 17% of specimens.
- No significant changes in load-and-shift test stability were observed after labral resection.
Conclusions:
- Isolated labral tears without capsuloligamentous damage may be safely debrided without risking dislocation.
- Significant increases in anterior translation can occur with resection of two or more labral zones.
- The study suggests that while dislocation is unlikely, increased anterior translation is a potential consequence of extensive labral debridement.