Prosthetic design of reverse shoulder arthroplasty contributes to scapular notching and instability

Table 3 Glenoid position by prosthesis design in 65 cases of reverse total shoulder arthroplasty, 2004-2011

Parameter	Grammont group (n = 18), mean ± SD	Lateral-design group (n = 47), mean ± SD	P-value
Glenoid position (mm)
Inferior glenoid osseous rim to lowest point of glenoid sphere[23]	1.5 ± 2.1	-0.6 ± 3.3	0.004
Peg-glenoid rim distance[16]	22.6 ± 1.7	21.4 ± 3.3	0.066
Glenoid inclination (°)
Inclination angle[23]	93.2 ± 15.3	101 ± 11.7	0.027
Prosthesis-scapular neck angle[16]	102 ± 21.3	106 ± 17.1	0.368
Prosthesis-scapular bone angle[24]	126 ± 16.9	132 ± 11.0	0.219