Strength to Weight Ratio
Titanium is lighter and stronger than most other surgical metals making it a much better option than other surgical metals. The average density of medical stainless steel is 1.8 times larger than that of Ti6Al4V. However, the average tensile yield strength of Ti6Al4V is 1.9 times larger than the average strength of medical stainless steel. These properties are very advantageous, because they allow engineers to create smaller, lighter, and less intrusive medical devices.
Titanium has a generally low electrical conductivity, which contributes to it being generally chemically inert in the human body. When titanium is exposed to pH levels comparable to that of the human body, a thin chemically inert oxide layer is formed over the surface of the metal. This film is also a huge contributing factor to the biocompatibility of titanium.
Any surgical implant meant for repairing bone needs to be stiff enough to hold the bones in place, but also shouldn't be much stiffer than the bone, because after healing it can put unwanted stress on the bone, if the bone is trying to naturally stretch past a threshold that the implant won't allow. Ti6Al4V has an average modulus of elasticity thats 1.7 times lower than that of the most common stainless steal used in medical implants.