Bone implant systems and methods of using them, including bone implants, bone anchors, precursors for bone anchors, methods for preparing bone anchors, methods for preparing bone anchor precursors, assemblies for inserting bone anchors, methods for preparing such assemblies, methods for using such assemblies to insert bone anchors, components for use in such assemblies, and substrates having the bone anchors secured therein. The bone implants may include a monolithic article made from a shape memory alloy.