er stability. In other words, glenoid retroversion is associated with posterior instability, but correction of retroversion may not correct the instability, which may be related to factors such as posterior soft tissue laxity and muscle imbalance.
Credit where credit is due. Gilles Walch and colleagues made this point in their 1998 articlePrimary glenohumeral osteoarthritis: clinical and radiographic classification.
We quote from that paper: "…subluxation of the humeral head correlates with glenoid wear, and it is reasonable to suggest that subluxation causes the wear. This presents a problem which must be emphasized: when one corrects the posterior glenoid wear (using a glenoid component with or without a graft) the subluxation is not corrected. This therefore leaves the risk of recurrence and may be responsible for glenoid loosening due to the 'rocking-horse' mechanism described by Franklin et al."
As we have shown with the ream and run procedure, posterior subluxation can be managed by the use of eccentric humeral head components and rotator interval plication without changing glenoid version.
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