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Characterization of the dysplastic Walch type C glenoid
R Paul1, N Knowles2, J Chaoui3
1The Roth McFarlane Hand and Upper Limb Center, University of Western Ontario, London, Ontario, Canada.
The Bone & Joint Journal
|August 1, 2018
Summary
Walch Type C dysplastic glenoid, characterized by excessive retroversion, presents a unique morphology with a deficient posteroinferior rim. These anatomical findings are crucial for surgical planning in shoulder reconstruction.
Area of Science:
- Orthopedic Surgery
- Anatomical Studies
- Radiology
Background:
- Walch Type C dysplastic glenoid is defined by excessive retroversion.
- Understanding its specific morphology is essential for effective treatment.
Purpose of the Study:
- To describe the detailed morphology of the Walch Type C dysplastic glenoid.
- To provide quantitative data on its anatomical variations.
Main Methods:
- Analysis of 29 shoulders with dysplastic glenoids using CT scans.
- Measurements included retroversion, inclination, dimensions, radius-of-curvature, surface area, depth, and humeral head subluxation.
- Goutallier classification and assessment of posterior rim deficiency were also performed.
Main Results:
- Mean retroversion was 37°, with significant posterior subluxation (90%).
- A deficient glenoid neck was observed in 62% of cases.
- The posterior glenoid rim typically exhibited a rounded or 'lazy J' morphology.
Conclusions:
- Walch Type C dysplastic glenoid features uniconcave retroversion, a deficient posteroinferior rim and scapular neck, and reduced depth.
- These anatomical characteristics are vital for surgical planning and component design in shoulder reconstruction.
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