These authors sought to determine the effect of humeral articular component positioning on changes in patient-reported outcomes after anatomic total shoulder arthroplasty in retrospective series of consecutive patients at 2 high-volume referral centers.
Among 95 patients the center of rotation shift was >2 mm in 62% of patients and >4 mm in 15%.
The authors concluded that in this retrospective analysis of total shoulder arthroplasty in which most components were well positioned, humeral component positioning did not associate with change in postoperative outcomes.
Comment: This is an analysis of total shoulders performed by highly experienced surgeons who were able to reproducibly place the humeral component in the desired position.
While the logistic regression did not show a clinical effect of humeral component position, it would of interest to compare the clinical outcomes of the 85% of cases with less than 4 mm shift of the center of rotation to the 15% of the shoulders that had >4 mm shift.
In any event, their results cannot be interpreted as demonstrating that the humeral head position is unimportant to the outcome of shoulder arthroplasty. Several cases referred to us demonstrate the importance of proper humeral head position.
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