These authors present a method to assess glenoid component version after TSA using only routine preoperative CT and postoperative radiographs (x-rays).
Preoperative glenoid version was measured using established methods with an axillary x-ray, 2-dimensional CT, and Glenosys software. Postoperative glenoid component version and inclination were measured for 61 TSA patients using Mimics software with preoperative CT and postoperative x-rays. Four patients also had postoperative CTs. Glenoid implantation and imaging were performed on 14 cadavers, allowing validation of results against postoperative CT glenoid retroversion measurement.
The average preoperative glenoid version measurements by axillary view were virtually identical to that for the CT and Glenosys software:
The average amount of change in glenoid version from preoperative to postoperative were virtually identical for the axillary views and the different CT measurements and the Gleosys software:
Comment: We have found that preoperative and postoperative glenoid version can be reproducibly measured using standardized axillary views as shown in the examples below. Note the presence of the "eye" of the spinoglenoid notch on each film (arrows).
We do not find that CT scans add value in assessing preoperative or postoperative glenoid version in the routine case of shoulder arthroplasty.
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