The second axis of Spine Fixation segmentation addresses device Types, which are classified into pedicle screws, rods, cages, and interbody spacers, each with distinct sub‑variants. Pedicle screws are further divided into mono‑axial, poly‑axial, and expandable designs, reflecting varying biomechanical objectives and surgical flexibility. Rods are segmented into straight, pre‑contoured, and dynamic stabilization systems, influencing construct rigidity and postoperative motion preservation. Cages include PEEK, titanium, and hybrid composites, differentiated by radiolucency, osseointegration potential, and cost profile. Interbody spacers comprise static and expandable models, each impacting disc height restoration and end‑plate contact. The revenue contribution of each Type aligns with procedural frequency and device pricing; pedicle‑screw systems dominate due to their universal applicability, while cages and spacers capture growth in minimally invasive and motion‑preserving techniques. Understanding these sub‑type distinctions refines the market taxonomy and supports granular demand forecasting across surgical specialties.