Retrospective Cohort Study
Copyright ©The Author(s) 2016.
World J Orthop. Nov 18, 2016; 7(11): 738-745
Published online Nov 18, 2016. doi: 10.5312/wjo.v7.i11.738
Table 1 Characteristics of 58 adults who underwent 65 reverse total shoulder arthroplasties, 2004-2011
CharacteristicGrammont group (n = 18)
Lateral-design group (n = 47)
P-value
Mean ± SDn (%)Mean ± SDn (%)
Male sex121 (67)311 (66)NA1
Age (yr)69 ± 7.370 ± 8.40.722
Follow-up (mo)43 ± 1532 ± 7.90.0004
Dominant side affected12 (67)21 (45)NA
Workers compensation02 (0)22 (3.4)NA
Glenoid sphere diameter
32 mm01 (0)28 (60)NA
≥ 36 mm181 (100)19 (40)NA
Table 2 Scapular notching and instability by prosthesis design in 65 cases of reverse total shoulder arthroplasty with minimum 2-year follow-up, 2004-20111
ParameterGrammont group (n = 18), n (%)Lateral-design group (n = 47), n (%)P-value
Scapular notching13 (72)11 (23)< 0.0012
Notching severity5
Grade 17 (39)8 (17)> 0.0013
Grade 22 (11)1 (2.1)NA4
Grade 32 (11)2 (4.3)NA4
Grade 42 (11)0 (0)NA4
Instability63 (17)0 (0)0.019
Table 3 Glenoid position by prosthesis design in 65 cases of reverse total shoulder arthroplasty, 2004-2011
ParameterGrammont group (n = 18), mean ± SDLateral-design group (n = 47), mean ± SDP-value
Glenoid position (mm)
Inferior glenoid osseous rim to lowest point of glenoid sphere[23]1.5 ± 2.1-0.6 ± 3.30.004
Peg-glenoid rim distance[16]22.6 ± 1.721.4 ± 3.30.066
Glenoid inclination (°)
Inclination angle[23]93.2 ± 15.3101 ± 11.70.027
Prosthesis-scapular neck angle[16]102 ± 21.3106 ± 17.10.368
Prosthesis-scapular bone angle[24]126 ± 16.9132 ± 11.00.219