**5. Conclusions**

Negligible correlations between pre- and postoperative radiographic measurements and clinical outcomes following primary rTSA using a 135◦ prosthesis design were demonstrated. However, these observations are of limited predictive value for outcomes following rTSA. Subsequently, there remains a debate regarding the ideal placement of the components during rTSA to most sufficiently restore active ROM while minimizing complications such as component loosening and scapular notching. Additionally, as the data from this study showed, there is still a considerable lack of data in assessing radiographic prosthesis positioning in correlation to clinical outcomes. As such, the importance of radiographic measurements and their correlation with clinical and functional outcomes following rTSA may be limited.

**Author Contributions:** D.P.B. and L.N.M. wrote the manuscript. D.M. contributed to study design and data conception. M.P.C. contributed to the statistical analysis. J.B.B. helped with data conception. R.A.C. helped with interpretation of data and radiographic measurements. A.D.M., A.A.R., P.J.D., R.G., E.L. helped with data conception and analysis. K.B. served as important reviewer and helped with data interpretation. All authors have read and agreed to the published version of the manuscript.

**Funding:** The University of Connecticut Health Center/UConn Musculoskeletal Institute has received direct funding and material support from Arthrex Inc. (Naples. Fl). The company had no influence on study design, data collection, or interpretation of the results or the final manuscript.

**Institutional Review Board Statement:** Ethical approval was obtained via Human Research Determination Form to the institutional review board (IRB) of the University of Connecticut (IRB 17-202-2).

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

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author. The data are not publicly available due to ethical reasons.

**Conflicts of Interest:** Authors B.D.P., M.D., M.L.M. and B.J.B., C.A.R. declare that they have no conflict of interest. A.D.M. reports research grants from Arthrex Inc., is a consultant for Arthrex Inc. and receives royalties from Arthrex Inc. D.P.J. is a consultant for Arthrex Inc. and receives royalties from Arthrex Inc. L.E. is a consultant for Arthrex Inc. and receives royalties from Arthrex Inc. C.M.P. receives personal fees from Arthroscopy Association of North America (AANA). Gobezie R is a consultant for Arthrex Inc. and receives royalties from Arthrex Inc. R.A.R. receives material or orther financial support from AANA; is a board or committee member of Amercian Shoulder and Elbow Surgeons; Receives financial and material support from Arthrex Inc. ansd receives royalties from Arthrex Inc; receives other financial or material support from Mayor League Baseball; is an Editorial or governing board for Orthopedics and a board or committee member for Orthopedics Today; receives research support from Paragen Technologies and holds stock or stock options for Paragen Technologies; Is an editorial or governing board for SAGE; receives royalties and material support by Saunders/Mosby-Elsevier; receives royalties or material support for SLACK incorporated and is a editorial or governing board for SLACK incorporated; is an editorial or governing board for Wolters Kluwer Health. K Beitzel is a consultant for Arthrex Inc. and receives royalties from Arthrex Inc.
