Vertebral body replacement and method for spanning a space formed upon removal of a vertebral body

摘要

A vertebral body replacement includes first and second end plates, and a compliant connector section between the end plates having one or more helical cuts to provide limited compliance between the end plates. The compliant connector section can be provided in a separate spacer that fits between the end plates or directly in one or more of the end plates. The adjoining end plate surfaces, and/or adjoining surfaces of the spacer, include a rotational interlock to inhibit rotational motion between the surfaces and allow a modular stacking assembly of the vertebral body replacement to accommodate a wide range of patients.

主权项

1. A vertebral body replacement for replacing at least one vertebral body between remaining upper and lower vertebral bodies, the vertebral body replacement comprising:
a first end plate having an upper surface configured to engage against a surface of the upper remaining vertebral body, and a lower surface opposite the upper surface spanning the first end plate; a second end plate having a lower surface configured to engage against a surface of the lower remaining vertebral body; a compliant connector section between the first end plate lower surface and the second end plate lower surface, the compliant connector section comprising a plurality of separate stackable spacers each having at least one helical cut configured and arranged to permit limited rotation between the first end plate and the second end plate in an anterior/posterior direction and a lateral direction; and a rotational interlock on the first end plate lower surface and an upper surface of at least one of the spacers, the rotational interlock being configured and arranged to inhibit rotational motion between the first end plate lower surface and the at least one spacer upper surface, wherein the rotational interlock comprises a first raised elongate portion extending in the anterior/posterior direction or the lateral direction on one of the first end plate lower surface or the at least one spacer upper surface and a first complementary elongate recess in the opposite surface.