**5. Conclusions**

In conclusion, considering all previously mentioned aspects, aTSAs with MBG provide poor clinical and radiological outcomes. Concerns from previous studies were fulfilled in that anatomic shoulder prostheses with an MBG present rapid inlay wear and have a low survival rate, reaching 32% in our study at 68.2 months. In the future, further long-term follow-up studies on modern MBGs need to be carried out, with more participants and the inclusion of a control group.

**Author Contributions:** Conceptualization, E.N. and R.O.; methodology, R.O.; software, E.N.; validation, R.O., E.N. and F.R.; formal analysis, H.K.; investigation, E.N.; resources, F.R.; data curation, E.N.; writing—original draft preparation, E.N.; writing—review and editing, E.N.; visualization, E.N.; supervision, R.O.; project administration, R.O.; funding acquisition, R.O. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** The study was conducted in accordance with the Declaration of Helsinki, and approved by the local Ethics Committee of the state of Upper Austria (Study number 1167/2020).

**Informed Consent Statement:** Informed consent was obtained from all subjects involved in the study. **Data Availability Statement:** All data relevant to the study are included in the article. Details regarding where data supporting reported results can be asked at the following e-mail address: emil.noschaj@yahoo.de.

**Conflicts of Interest:** The authors declare no conflict of interest.
