An<unk>  (colloquially known as a "spine<unk> ") is a prosthesis used in spinal<unk>  procedures to maintain foraminal height and decompression. They are cylindrical or square-shaped devices, and usually threaded. There are several varieties: the Harms<unk> , Ray<unk> , Pyramesh<unk> , InterFix<unk> , and lordotic LT<unk> , all of which are made from titanium; the Brantigan<unk> , made from carbon fibre; and the Cortical Bone Dowel, which is cut from allograft femur. The<unk> s can be packed with autologous bone material in order to promote arthrodesis. Such implants are inserted when the space between the spinal discs is distracted, such that the implant, when threaded, is compressed like a screw. Unthreaded implants, such as the Harms and Pyramesh<unk> s have teeth along both surfaces that bite into the end plates. Technology: expansion vs. static devices Expandable implant devices are at the forefront of technology in this field, with<unk> s that expand in place for optimal end-plate-to-endplate fit and correction of lordosis. There are several technologies for<unk>  expansion; FLXfit by Expanding Orthopedics offers a unique and patented 3D articulation and lordotic expansion, Staxx by Spinewave stacks plates as risers, Varilift by Wenzel - uses a screw device for enlargement and AccuLIF by CoAlign, which has a unique locking hydraulic solution for precise expansion. FlareHawk by Integrity Implants uses stent-like technology, expanding in width, height, and lordosis. Once placed, the<unk> s resist flexion and extension of the spine, and axial forces across the ventral and middle columns.
Interbody fusion cage
Triple arthrodesis
Intervertebral disc annuloplasty
Intervertebral disc arthroplasty
Minimally invasive spine surgery
Discectomy
Bone collar
Anterior cervical discectomy and fusion