Glenoid baseplate position in reverse shoulder arthroplasty.

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Biomechanics

Background:

• Reverse shoulder arthroplasty (RSA) is increasingly popular, prompting renewed interest in baseplate positioning.
• Understanding glenoid baseplate positioning is crucial for optimizing RSA outcomes and minimizing complications.

Purpose of the Study:

• To review current literature on glenoid baseplate positioning in RSA.
• To analyze clinical and biomechanical perspectives of baseplate placement and inclination.
• To discuss how evolving implant designs impact positioning parameters.

Main Methods:

• Conducted an extensive literature search of biomechanical and clinical studies.
• Investigated outcomes related to variations in baseplate positioning and inclination.
• Examined changes in positioning parameters with modern implant designs.

Main Results:

• No clear consensus exists on the gold standard for glenoid baseplate placement.
• Inferior glenoid placement may be unnecessary with lateralized glenoid designs.
• Inferior tilt offers biomechanical strength, potentially mitigating superior tilt issues with lateralized designs.

Conclusions:

• Optimal glenoid version for RSA remains largely unknown.
• The significance of glenoid baseplate positioning for functional outcomes requires re-evaluation due to rapid RSA design advancements.