Walch et al reported a classification for primary glenohumeeral osteoarthritis. The authors are from Centre Hospitalier Lyon Sud in France.
Patient selection: primary glenohumeral osteoarthritis
Primary Findings in the Glenoid
Additional Features
Type
humeral head centered with central erosion
minor erosions
A1
major erosions
A2
asymmetrical posterior wear of the glenoid with posterior subluxation of the humeral head
minor erosion with joint space narrowing, subchondral sclerosis, and osteophytes
B1
major erosion with biconcave glenoid
B2
dysplastic glenoid with retroversion > 25°
head remains centered
C
With Type A there is an equal balance of forces on the glenoid and no subluxation.
With Type B there is asymmetrical posterior force distribution on the glenoid.
Asymmetrical load distribution on the posterior glenoid may predispose to loosening of the glenoid component after arthroplasty.
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Specialty: Surgery, orthopedic