I applaud you for your research efforts, however, I hope someone experienced will be working closely with you during your measurements. I would suggest looking through "The Adult Hip" There is a lot of information about osteolysis and other problems around THAs. There is a new volume coming out this December. You may be able to find the older edition at your med or ortho library.

Thanks for the advice Ortho Doc. I will follow-up your reference at the library (and no worries, I'll definitely be supervised).