**5. Conclusions**

Our results sugges<sup>t</sup> that judicious patient selection in the older-aged patient (75+ years) for the type of shoulder replacement needs to be performed individually and not merely on the basis of patient age. This process can then lead to higher selection towards aTSR, which demonstrated in the current setting significantly better ROM and clinical outcomes than same-aged patients with an rTSR. Additionally, the complication rate is less for an aTSR in the first 2 years following shoulder replacement, making this an acceptable surgical option despite increased age. However, this study only has a short follow-up of 2 years, therefore the outcomes are to be judged carefully and preliminarily, as further prolonged research is necessary.

**Author Contributions:** Conceptualization: M.J.K.S., J.A.C. and S.N.B.; Methodology: M.J.K.S., J.A.C. and S.N.B.; Validation: M.J.K.S., J.A.C. and S.N.B.; Formal analysis: J.A.C.; Investigation: M.J.K.S. and J.A.C.; Resources: J.A.C. and S.N.B.; Data curation: M.J.K.S., J.A.C. and S.N.B.; Writing—original draft preparation: M.J.K.S., J.A.C. and S.N.B.; Writing—review and editing: M.J.K.S., J.A.C. and S.N.B.; Visualization: M.J.K.S., J.A.C. and S.N.B.; Supervision: S.N.B.; Project administration: M.J.K.S., J.A.C. and S.N.B.; Funding acquisition: J.A.C. and S.N.B. All authors have read and agreed to the published version of the manuscript.

**Funding:** Mathys and Stryker received financial assistance for data collection and statistical support from the University of Melbourne.

**Institutional Review Board Statement:** The study was conducted in accordance with the Declaration of Helsinki, and approved by the Ethics Committee of Monash University (CF10/0378—2010000170; 26 February 2010) and was registered in Australian New Zealand Clinical Trials Registry (AC-TRN12613001183774; 29 October 2013).

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study.

**Data Availability Statement:** Data available on reasonable request due to privacy and ethics board restrictions. The data presented in this study are available on reasonable request from the corresponding author. The data are not publicly available due to privacy and ethics board restrictions.

**Acknowledgments:** The authors wish to acknowledge Richard J Dallalana, Jeff Hughes, Richard Page and Warwick Wright for submitting patients for the study. We thank Maxim Christmas (MC) for reading the radiographs, Harry Clitherow (HC) for adjudicating the radiographs and Kelli Gray and Caroline Thomas for their database management. We would like to thank Ken Sharpe from the Statistical Consulting Centre, School of Mathematics and Statistics, University of Melbourne for statistical analysis and advice and assistance.

**Conflicts of Interest:** Maciej Simon: This author, their immediate family, and any research foundation with which they are affiliated did not receive any financial payments or other benefits from any commercial entity related to the subject of this article. Jennifer Coghlan: Receives funds for data collection, entry and storage through her Department of Monash University from Mathys Bettlach, Switzerland, Mathys Australia and Wright Medical, Australia. Simon Bell: Has a consultancy agreemen<sup>t</sup> with Mathys Ltd. Bettlach, Switzerland, and Wright Medical, Australia.
