Friday, February 28, 2014

Avoiding scapular notching in reverse total shoulder - a cadaver study

Evaluation of the role of glenosphere design and humeral component retroversion in avoiding scapular notching during reverse shoulder arthroplasty.

These authors implanted in 40 cadaver shoulders the Aequalis Reversed Shoulder Prosthesis (shown below in a photo from the website).
(Note the proximity of the upper medial aspect of the humeral component to the site of notching on the scapula). 

They used 8 different glenoid combinations: * 36-mm glenosphere: centered (standard), eccentric, with an inferior tilt, or with the center of rotation lateralized by 5 or 7 mm; and * 42-mm centered glenosphere: used alone or with the COR lateralized by 7 or 10 mm. The humeral component was positioned in 0, 10, 20, 30, and 40 of retroversion. 

Lateralization of the glenosphere and larger glenosphere diameters of curvature resulted in less risk of unwanted contact with the scapula. Retroversion of the humeral component also reduced the risk of unwanted contact with the scapula.

We use a glenosphere that has built in lateral displacement to avoid unwanted contact of the humeral component with the glenoid, which can result in both notching and instability. Our approach is shown here.
Consultation for those who live a distance away from Seattle.

Check out the new Shoulder Arthritis Book - click here.

Click here to see the new Rotator Cuff Book

To see the topics covered in this Blog, click here

Use the "Search" box to the right to find other topics of interest to you.

You may be interested in some of our most visited web pages including:shoulder arthritis, total shoulder, ream and runreverse total shoulderCTA arthroplasty, and rotator cuff surgery as well as the 'ream and run essentials'