Quantifying bone loss and lateralization with standardized baseplate versus augmented baseplates

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Radiology

Background:

• Reverse shoulder arthroplasty is a key treatment for complex shoulder conditions.
• Augmented baseplates can correct glenoid deformities.
• Quantification of bone loss and lateralization with augmented baseplates is not well-established.

Purpose of the Study:

• To compare bone removal volume and net lateralization between standard and augmented baseplates.
• To evaluate augmented baseplates for correcting glenoid inclination and retroversion.

Main Methods:

• CT scans of 21 patients with varying glenoid inclination were analyzed.
• Four surgeons virtually placed neutral and augmented baseplates.
• Bone reaming volume and net lateralization were calculated after correcting glenoid parameters.

Main Results:

• Augmented baseplates led to ~50% less bone removal (619 mm³ vs. 1102 mm³).
• A 10-degree augmented baseplate resulted in 2.4 mm greater lateralization.
• Similar baseplate backside seating was achieved with both types of baseplates.

Conclusions:

• Augmented baseplates offer substantial bone preservation in shoulder arthroplasty.
• They provide predictable lateralization, aiding in anatomical restoration.
• This study quantifies the benefits of augmented baseplates for glenoid correction.