In laymans terms, Titanium implants are strong and the body accepts them, but they’re way too stiff because the metal takes almost all the pressure, the real bone next to it gets lazy and starts to weaken over time (like a muscle that doesn’t get used). This was the issue with earlier titanium implants and joint replacements the new implant though are made from a special zinc alloy shaped like a lightweight, sponge-like lattice it is flexible and almost like real bone, so it shares the load properly and doesn’t cause that weakening problem Whats REALLY fucking cool is that its also designed to dissolve over time So its a temporary implant, and as it dissolves, it releases minerals and ions that actually promote your new, healthy bone in its place When the job is done, the implant is mostly gone and your own bone has taken over and is the proper strength -medical engineering is a marvel