Effect of glenoid deformity on glenoid component placement in primary shoulder arthroplasty. JSES

The January JSES published a study  Effect of glenoid deformity on glenoid component placement in primary shoulder arthroplasty. The important finding here was that 13 patients having primary total shoulder arthroplasty had an average of 13 degrees of glenoid retroversion with a range from 1 to 42 degrees; seven cases had retroversion of 10 degrees or more using the method of Friedman et al. (these authors found that normal glenoids were anteverted by an average of 2+/-5 degrees, range: 14 anteversion to 12 degrees of retroversion).

From this we conclude that glenoid retroversion is not the exception, but often the rule in glenohumeral arthroplasty.

As the authors of this article point out, reaming for  'correction' of retroversion often comes with the sacrifice of valuable and limited glenoid bone stock, potentially compromising the security of fixation.

For this reason, our tendency has been to accept retroversion, preserve bone stock and use soft tissue balancing and eccentric humeral head components to stabilize the humeral head in the socket when performing glenohumeral arthroplasty.

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