**5. Conclusions**

TOS is a powerful fixation technique for patients with SPD. We achieved the vertical reduction in SPD more easily through fluoroscopy during the operation than with horizontal anatomical reduction, while horizontal displacement caused inferior satisfaction.

**Author Contributions:** Conceptualization, P.-H.S. and C.-H.T.; methodology, P.-H.S. and C.-H.T.; validation, P.-H.S. and C.-H.T.; formal analysis, C.-H.T.; investigation, P.-H.S., Y.-H.H. and C.-W.Y.; resources, C.-Y.C., Y.-S.L., H.-T.C. and C.-H.T.; data curation, P.-H.S.; writing—original draft preparation, P.-H.S.; writing—review and editing, C.-H.T.; visualization, C.-H.T.; supervision, H.-T.C. and C.-H.T.; project administration, C.-H.T. 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 observational retrospective study protocol was approved by the Research Ethics Committee of the China Medical University Hospital, Taichung, Taiwan (protocol ID: CMUH108-REC3-144).

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

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The authors would like to thank all colleagues who contributed to this study. We are grateful to Hsiang-Wen Lin, for her collaboration and providing the Traditional Chinese (Taiwan) Version of the EQ-5D-5L Questionnaire during preliminary investigations, and to Chiu Yu Shih, in the orthopedics department of Changhua Christian hospital, who assisted with the IRB approval of this study.

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