- The primary benefit of using titanium alloys instead of commercially pure titanium in orthopedic implants is their enhanced mechanical strength.

- While commercially pure titanium is known for its excellent biocompatibility and corrosion resistance, it lacks the necessary mechanical strength and fatigue resistance required for load-bearing applications.
- Titanium alloys, such as Ti-6Al-4V, are engineered by adding elements like aluminum and vanadium, which significantly improve the mechanical properties of the material.
- This allows implants made from titanium alloys to better withstand the stresses and strains encountered within the human body, ensuring greater durability and longevity of the orthopedic implant.

In summary:
- Commercially pure titanium offers excellent biocompatibility and corrosion resistance but has lower mechanical strength.
- Titanium alloys provide enhanced mechanical strength and improved fatigue resistance, making them more suitable for structural applications in orthopedics.

This improvement is critical for applications such as joint replacements and bone fixation devices where both biocompatibility and mechanical integrity are essential.

Reference: Markel, M.D., Shapiro, I.M. *Biomaterials in Orthopedics*, Volume 2, Chapter 5, Page 123