Z‐TUpx ISRCTN85422168.

Methods	Randomised controlled trial
Participants	90 (target) participants aged above 60 years with complex (3‐ or 4‐part) proximal humeral fractures
Interventions	1. Reverse shoulder arthroplasty with a 155‐degree inclination angle 2. Reverse shoulder arthroplasty with a 135‐degree inclination angle 3. Non‐surgical treatment (rehabilitation only)
Outcomes	Follow‐up: 24 months Quality of life measured using the Western Ontario Osteoarthritis score (WOOS); pain, activities of daily living, Constant score (ROM and strength); quality of life measured using the Subjective Shoulder Value (SSV) questionnaire; bone healing response evaluated using x‐ray, complications and revisions reported in medical records
Notes	Found in November 2021 top‐up search Ongoing trial. Trial dates: April 2021 to September 2027 Protocol and Patient Information Sheet included in trial registration