SIGNATURE, lumbar TLIF spacer - PEEK radiolucent material SIGNATURE® is an articulating lumbar TLIF spacer made of PEEK radiolucent material that enables the restoration of lumbar lordosis, and may be used through an MIS portal. Controlled articulation: Allows repeatable placement Minimally invasive approach: Helps reduce anatomic disruption Custom Instrumentation: Specially designed holder allows for one step insertion and articulation