The subjected screw is part of the zLOCK Lumbar Facet Fixation System. The zLOCK Lumbar Facet Fixation System is a modular facet screw system for posterior lumbar spinal stabilization. The zLOCK Lumbar Facet Fixation System consists of two main components: 1) a Facet Screw with a washer and 2) a Modular spacer. The system including a dedicated tool set.
A small, threaded, implantable rod with a screw head and drive intended for internal spinal fixation by being screwed into the spine to hold a correction/stabilization device (e.g., rod, plate, tether) to bone; it is made of a material that is not chemically degraded or absorbed via natural body processes (e.g., surgical steel, titanium alloy, carbon fibre). It is available in various types (e.g., pedicle or transfacet, with a slotted, cross, star, or polygonal drive), and is typically used to provide immobilization and stabilization of spinal segments in the treatment of spinal instabilities or deformities. A screw head adaptor intended to stabilize a rod may be included with the screw.