Software like WinRAR or 7-Zip is required to "join" these parts back into a single usable file (e.g., a PDF report, a database, or a large image file).
The ratio of the preserved thickness of the femoral head (formula:
Could you tell me (e.g., a medical database, a technical forum, or a work server)? Knowing the source would help me confirm if you are looking for medical analysis or technical hardware specs.