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Dedicated to providing patients with the best knowledge regarding their shoulder or elbow condition along with the most current evidence-based information regarding the options available for their care. Frederick A. Matsen III, M.D., author.

Blog: Shoulder Arthritis / Rotator Cuff Tears: causes of shoulder pain

The B2 glenoid: what surgeons are "correcting", and does "correcting" it improve the patient's outcome?

Saturday, October 17, 2026 8:43 PM

The B2 glenoid. A B2 glenoid is a biconcave glenoid: posterior wear has formed a second concavity (the neoglenoid) behind the original surface (the paleoglenoid), with a ridge between them, and the humeral head is decentered posteriorly ...

Robotics in reverse shoulder arthroplasty – 16 questions

Tuesday, October 6, 2026 8:46 AM

The First Ever Use of the Word "Robot""RUR = Rossum’s Universal Robots"Robotics in Shoulder ArthroplastyIn briefRobotic assistance is being introduced into reverse total shoulder arthroplasty, carried by its use in the knee and hip. It ...

The Challenge of Intraoperative Posterior Instability in Anatomic Shoulder Arthroplasty The Magic of the Anteriorly Eccentric Humeral Head

Tuesday, September 29, 2026 10:39 AM

While posterior decentering of the humeral head on the glenoid may be noted on a preoperative axillary “truth view” taken with the arm in a position of functional elevation it is not always evident before shoulder arthroplasty. At ...

Reverse total shoulder: getting the best comfort and function with the least risk for our patients

Sunday, September 20, 2026 12:14 PM

Patient factors (overall health, diagnosis, comorbidities, sex, bone quality, cuff status, and steroid use) have a major effect on the results of reverse total shoulder arthroplasty (RSA). Most patients do well, but there are risks of ...

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