This descriptive implant analysis measures glenoid, humeral, and global lateral offset across 28 configurations of 22 commercially available RSA systems, all normalized to the Grammont Delta III, to provide an objective framework for understanding what 'lateralization' actually means in the context of different implant designs.
When selecting an RSA system, don't assume 'lateralized' marketing language translates to equivalent offset — the same descriptor covers a 13–36 mm range, and the dominant driver of humeral lateralization is onlay vs. inlay platform design, not neck-shaft angle.
Use this classification framework (M/ML/L/HL/VHL) to anticipate the expected lateral offset of your implant and adjust surgical technique (humeral cut height, glenoid tilt, reaming depth) accordingly, particularly in smaller patients where VHL designs risk overstuffing.
This descriptive implant analysis measures glenoid, humeral, and global lateral offset across 28 configurations of 22 commercially available RSA systems, all normalized to the Grammont Delta III, to provide an objective framework for understanding what 'lateralization' actually means in the context of different implant designs.
When selecting an RSA system, don't assume 'lateralized' marketing language translates to equivalent offset — the same descriptor covers a 13–36 mm range, and the dominant driver of humeral lateralization is onlay vs. inlay platform design, not neck-shaft angle.
Use this classification framework (M/ML/L/HL/VHL) to anticipate the expected lateral offset of your implant and adjust surgical technique (humeral cut height, glenoid tilt, reaming depth) accordingly, particularly in smaller patients where VHL designs risk overstuffing.