Grafts to replace the ruptured ligament don’t naturally integrate with the bone; surgeons use screws to hold the graft in place. Titanium screws will last, but can shred the graft over time ...

Notably, a casing ring no longer features, and the movement is placed on chassis mounting rubbers fixed by four grade-5 titanium screws. Richard Mille RM 17-02 Tourbillon in titanium, richardmille.com ...