*2.1. Study Design*

The authors retrospectively reviewed the records of consecutive prospectively collected primary TSAs performed at La Tour hospital (Meyrin, Switzerland). The study was conducted according to the Declaration of Helsinki principles, was approved prior to beginning by the Commission cantonale d'éthique de la recherche (CCER) de Genève (Shoulder Outcomes Clinical Study, n◦ 2014-277), and all patients provided written informed consent for the use of their data for research purposes.

#### *2.2. Patient Selection, Demographic and Operative Data*

Between June 2015 and June 2019, 284 patients had a primary shoulder arthroplasty performed by the senior author (A.L.). Patients were included in the study if they were operated on at La Tour hospital and underwent a TSA (*n* = 139). Patients were excluded if they did not have a complete pre-operative evaluation due to the need for emergency care (*n* = 13), if they deceased due to other reasons than surgery before the 1-year follow-up visit (*n* = 5), and if they were lost to follow-up (LTFU, *n* = 6). This left a study cohort of 116 patients aged 77.8 ± 7.6 years (median, 78.0; range, 57–94) at index surgery, comprising 86 women (74%) and 30 men (26%), available for analyses (Table 1, Figure 1). The principal diagnoses were rotator cuff tear arthropathy (*n* = 62, 53%), primary glenohumeral osteoarthrosis (*n* = 39, 34%), secondary glenohumeral osteoarthrosis (*n* = 7, 6%), acute trauma (*n* = 4, 3%), osteonecrosis (*n* = 1, 1%), and others in 3 cases (3%). The type of procedure was anatomic TSA for 24 patients (aTSA, 21%) and reverse TSA for the other 92 patients (rTSA, 79%). The operations were performed by a single senior surgeon (A.L.). A majority of the patients were operated on the dominant arm (*n* = 77, 66%) through a deltopectoral approach (*n* = 62, 53%) or subscapularis and deltoid sparing approach (*n* = 47, 41%) [4,5]. A patient specific guide was used in 13 cases (11%) to help the prothesis implantation and cementation was required in 23 cases on the glenoid side (20%, for aTSA only) and in 7 cases on the humeral side (6%). The patient managemen<sup>t</sup> time in the operating room (OR) was 121 ± 26 min (median, 125; range, 60–210 min) and patient length of stay was 3.6 ± 2.0 days (median, 3.0; range, 1.2–12.9 days).

**Figure 1.** Value dashboard.




