Dear Colleagues,

Reverse shoulder arthroplasty (RSA) for the end-stage shoulder condition is one of the most significant advances in shoulder surgery over the last two decades. However, because of its non-anatomical design, shoulder kinematics changes in RSA recipients. These alterations had been shown to be associated with reduced joint range of motion, scapular notching, and polyethylene wear. From the industrial point of view, the RSA design has been modified from the original Grammont design (the large-diameter glenosphere set on the glenoid to medialize the center of rotation and to increase the moment arm, and the increased neck-shaft angle to lengthen the reduced acromiohumeral interval and to increase shoulder stability) to relatively lateralized design (lateralized glenoid and/or lateralized humerus). Thus, scapular dyskinesis should be focused on understanding the newly developed surgical procedure and conducting better clinical outcomes.

It should be done from the point of functional morphology and kinesiology.

In this Special Issue for the RSA, contributions regarding the related conditions such as altered scapular kinematics and scapular behavior in RSA patients, shoulder muscle activity, and function in the rehabilitation process after RSA are widely required.

Dr. Kotaro Yamakado
Guest Editor

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• Scapular kinematics
• Scapulohumeral dyskinesis
• Post-operative rehabilitation
• Reverse shoulder arthroplasty
• Shoulder arthroplasty