Z‐TUp Boyer 2021.

Methods	Single‐centre, randomised controlled trial. Computer randomisation with various block sizes
Participants	99 participants with 3‐ and 4‐part "displaced" acute proximal humeral fractures, aged between 40 and 80 years. Of 85: 61 females, 24 males; mean age 73.7 years
Interventions	1. Intramedullary nail (Multilock, DePuy Synthes) 2. Locking plate (SURFIX, Integra)
Outcomes	Follow‐up: mean 66 months (minimum 4 years) American Shoulder and Elbow Surgeons score (ASES), Constant score, Simple Shoulder Test score, complications, revision surgery, shoulder pain
Notes	Found in November 2021 top‐up search. Also listed as an ongoing study: NCT01557413. There are differences between the protocol at trial registration ‐ including follow‐up (the primary follow‐up was 1 year) and different outcome measures. There are also abstracts reporting interim results. Although suitable for inclusion, we would defer inclusion to approach the authors to obtain follow‐up data at earlier times and clarification on the follow‐up procedures.