Walch Classification (Glenoid Morphology, OA)
Walch classification of glenoid morphology in primary glenohumeral osteoarthritis (Walch 1999; Bercik 2016).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Humeral-head position
- Posterior subluxation
- Glenoid retroversion
- 23 deg
- Glenoid concavity
- Biconcave
- Central erosion severity
- Minor central erosion
Result: Walch type B2
The tool opens with these values already filled in. Replace them with your own.
What the result means
- A / B
- A = centered head (A1 minor, A2 major central erosion); B = posterior subluxation (B1 no biconcavity, B2 biconcave, B3 monoconcave with >= 15 deg retroversion or >= 70% subluxation).
- C / D
- C = dysplastic glenoid retroversion over 25 deg; D = anterior subluxation or glenoid anteversion. Subluxation direction is the top-level split.
What you enter
- Humeral-head position (centered / posterior / anterior)
- Glenoid retroversion (degrees, anteversion negative)
- Glenoid concavity (single / biconcave)
- Central erosion severity (minor / major)
- Retroversion is dysplastic (congenital, not erosion-caused)
How this is calculated
Walch G, Badet R, Boulahia A, Khoury A. Morphologic study of the glenoid in primary glenohumeral osteoarthritis. J Arthroplasty. 1999;14(6):756-760. (Modified: Bercik MJ, et al. J Shoulder Elbow Surg. 2016;25(10):1601-1606, adding B3 and D.) Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.