*2.3. Hemiarthroplasty Group*

Hemiarthroplasty was performed on 108 patients (85%). On pre-operative radiographs, Ficat and Cruess classification stages were in 12 times stage 2, in 36 times stage 3, in 37 times stage 4 and in 21 times stage 5. Two pre-operative radiographs were missing (1, 8%). Hemi-metal implants were implanted 67 times (62%), 6 (5%) hemi pyrocarbone, 19

(18%) pyrocarbone interposition (PI) sphere and 16 (15%) resurfacing. Overall a stem was used in 67% of times. Hemi-metal implants included 63 Aequalis Anatomic (Tornier SAS-Wright Medical, Bloomington, MN, USA). Among them 6 were uncemented. Otherwise 4 uncemented Ascend flex anatomic were used (Tornier SAS-Wright Medical). Hemipyrocarbone implants were uncemented Ascend Flex anatomic stems (Tornier SAS-Wright Medical). PI spheres corresponded to Inspyre implant (Tornier SAS-Wright Medical). Resurfacing and stemless implants consisted of 6 Aequalis Resurfacing Head (Tornier SAS-Wright Medical), 4 Copeland (Biomet, Inc., Warsaw, IN, USA), 2 Global Cap Resurfacing (DePuy Orthopaedics, Warsaw, IN, USA), 2 TESS (Total Evolutive Shoulder System) (Biomet, Inc., Warsaw, IN, USA), 1 HemiCAP-Arthrosurface ® system (Arthrosurface, Inc., Franklin, MA, USA) and 1 Affinis stemless (Mathys, Bettlach, Switzerland).

#### *2.4. Total Anatomic Arthroplasty*

Total anatomic arthroplasty was performed on 19 patients (15%). On pre-operative radiographs, Ficat and Cruess classification was in 1 time stage 3 and in 14 times stage 5. Four pre-operative radiographs were missing. On the glenoid side, 3 (16%) metalbacked and 16 (84%) keeled full polyethylene (PE) components were used. Humeral stems consisted of Aequalis anatomic for 17 (Tornier SAS-Wright Medical) and Ascend flex stems (Tornier SAS-Wright Medical) for 2. The stem was cemented for 78% of the procedures.
