**5. Conclusions**

This study introduces a method to statistically compare the severity of corrosion damage at eight distinct zones of stem tapers. A pool of 137 retrieved total hip replacement implants was visually scored at the head-neck junction for corrosion damage using Goldberg's method. An OLR model with proportional odds was used to determine the odds of observing a higher score at a primary zone compared with a reference zone. The findings of this study can be highlighted as below:


**Author Contributions:** R.M. studied the implants, conducted the statistical analysis, discussed the results and drafted the manuscript. R.H.O., M.T. and L.B.S. supervised and contributed to all the project tasks including revising and writing of the paper.

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

**Acknowledgments:** The authors would like to acknowledge the support through an Australian Government Research Training Program Scholarship for Roohollah Milimonfared's PhD. The authors also thank the Department of Orthopaedics and Trauma, Royal Adelaide Hospital (Adelaide, Australia), and in particular, Kerry Costi and Roumen Stamenkov for their assistance in accessing the retrieved implants.

**Conflicts of Interest:** The authors have no conflicts of interest to declare.
