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Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
Glenoid morphology in reverse shoulder arthroplasty: classification and surgical implications
Mark A Frankle1, Atsushi Teramoto, Zong-Ping Luo
1Florida Orthopaedic Institute, Tampa, FL 33637, USA. frankle@pol.net
Journal of Shoulder and Elbow Surgery
|June 2, 2009
Summary
Glenoid morphology varies significantly in reverse shoulder arthroplasty. A new classification system identifies normal and abnormal types, impacting component placement and surgical techniques for better outcomes.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Radiology
Background:
- Glenoid morphology variations pose challenges in reverse shoulder arthroplasty (RSA) component placement.
- Accurate glenoid component fixation is crucial for RSA success.
Purpose of the Study:
- To classify glenoid morphology in shoulders undergoing RSA.
- To investigate the impact of different glenoid morphologies on component fixation.
Main Methods:
- Classified 216 glenoids into normal and abnormal types using plain radiographs, 2D CT, and 3D CT scans.
- Subclassified abnormal glenoids based on erosion sites: posterior, superior, global, and anterior.
- Compared six anatomic and two surgical parameters across classified groups.
Main Results:
- Abnormal glenoids had significantly shorter standard centerlines (19.6 mm) compared to normal glenoids (28.6 mm).
- Abnormal morphology reduced peripheral screw placement area by 42%, limiting options to anterior and inferior quadrants.
- Spine centerline provided longer bony distance in abnormal glenoids (34.9 mm).
Conclusions:
- A reliable classification system for glenoid morphology (normal, abnormal with 4 erosion subgroups) was established for rotator cuff deficient shoulders.
- Abnormal glenoid morphology significantly affects anatomical and surgical factors, requiring technique adjustments in RSA.
