**3. Results**

None of the patients were lost to the follow-up. The average age of the patients at the time of surgery was 64.8 years (SD: 11.0) and, on the day of the examination, 70.9 (SD: 8.7) years. Most of the subjects received the prosthesis on their left shoulder, comprising 13 patients (52%). Among them, 12 patients were right-handed. A total of 12 patients had prostheses implanted on the non-dominant side. In all patients, an Eclipse™ humeral prosthesis combined with a Universal Glenoid™ baseplate from Arthrex® was implanted. The Univers 3D Metal Back is made of the Material Ti6Al4V. The Eclipse™ Humeral Head is made of the material CoCr, and the inlay is made of PE. The company of the tools, Arthrex Inc., is based in Naples, FL (34108-1945), USA. Details of the implants used in every patient were documented, and acceptable combinations between the size of the baseplate and humeral head in which the radii fit together properly were chosen for every patient. Table 1 shows patients' demographics, implant details, preoperative glenoid morphology, RTC degeneration, and postoperative deviation from the native center of rotation.


**Table 1.** Patient demographics and implants.

**Abbreviations:** SC: M. subscapularis, SS: M. supraspinatus, IS: M. infraspinatus, TM: M. teres minor, OA: osteoarthritis, pOA: posttraumatic OA.
