An afternoon in Lyon
An afternoon with Gilles Walch at his home in Lyon, discussing difficult shoulder cases. Gilles Walch is among the most experienced shoulder surgeons in the field, and the classification of glenoid wear patterns used worldwide bears his name.
The cases discussed
The discussion covered three difficult problems in general terms: a type C dysplastic glenoid with bilateral shoulder arthritis, complex instability following several previous operations, and a revision arthroplasty.
We also reviewed when anatomic and reverse shoulder replacements are each appropriate, which remains the central decision in shoulder arthroplasty.
What the glenoid is and why its shape matters
The glenoid is the socket of the shoulder, a shallow and slightly dished surface on the outer edge of the shoulder blade. In an arthritic shoulder the glenoid often wears unevenly rather than uniformly, so that it becomes tilted or tipped backwards, and in some people it is unusually shaped from the outset, which is what dysplastic means.
Describing those patterns consistently is what a classification system is for. It allows two surgeons in different countries to be confident they are discussing the same problem, and it allows results to be compared between groups of patients whose anatomy was genuinely comparable. The shape of the glenoid matters in practice because it governs how a socket component can be positioned and supported, and therefore bears on whether an anatomic or a reverse replacement is the better option. Individual results vary, and that decision is made after assessment and imaging, usually including a CT scan.
What revision surgery involves
Revision arthroplasty means operating again on a joint that has already been replaced. It is more demanding than the original operation for several reasons: bone has already been removed, the soft tissues are scarred, the existing components have to come out without causing further damage, and the reason for the failure has to be identified before anything is reconstructed.
Why difficult cases are discussed
Any one surgeon's experience of a rare problem is too small a sample to learn from on its own. A discussion of this kind is not a matter of handing over a decision. It is a matter of hearing how someone who has seen the same pattern many more times has thought about it, including which approaches they have tried and abandoned, which is information that rarely reaches print.
Related information
See our post on the difference between ATSR and RTSR, and our shoulder arthritis, anatomic total shoulder replacement, reverse total shoulder replacement and shoulder instability pages.