Described are medical devices for supporting or inducing bone growth including an implant body defining one or more separation-assist lines that facilitate separation of the body into two or more substantially pre-defined pieces. The implant body can be used and implanted as a whole or may be separated into multiple pieces, some or all of which can be used at one or multiple implant sites in a patient. Separation-assist lines in implant bodies can serve a dual role in imparting increased and controlled flexibility to the overall body when used as a whole at an implant site. Also described are methods of making and using, and kits including, such medical devices.
