These authors modeled the reconstruction of shoulders with posterior bone deficiency and increased retroversion using a three-dimensional computer surgical simulation. They modeled both a standard glenoid component having a uniform thickness and a posteriorly augmented component.
Their model predicted 4.5 mm more medialization of the joint line with the standard component in comparison to the posteriorly augmented glenoid component.
Comment: This is a report of a computer simulation. As the authors point out, " The importance of decreasing medialization while correcting excessive glenoid retroversion is not fully understood but may improve joint stability and strength of the shoulder by restoring better tension of the rotator cuff." However, in the actual practice of shoulder arthroplasty in vivo, the tension of the rotator cuff is optimized by the height of the humeral components, which can move the center of rotation to the position where mobility and stability are optimized. A tendency for posterior instability can also be managed by the use of asymmetric humeral head components and rotator interval plication.
At this point the clinical effectiveness and durability of augmented glenoid components have yet to be demonstrated. We will follow with interest.
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To learn more about shoulder arthritis and what can be done about it, see the Shoulder Arthritis Book.
To learn more about the rotator cuff, see the Rotator Cuff Book
Consultation for those who live a distance away from Seattle.
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 run, reverse total shoulder, CTA arthroplasty, androtator cuff surgery as well as the 'ream and run essentials'
See from which cities our patients come.
See the countries from which our readers come on this post.
