Intervertebral fixation: clinical results with anterior cages

Threaded, cylindrical cages used for inter-vertebral fusion are a new and distinct class of segmental spinal fixation devices. These devices are not intradiscal spacers that require additional segmental stabilization. They are designed as stand-alone, inter-vertebral implants that function as an instrumented anterior interbody fusion. Clinical outcomes of anterior lumbar surgery can be improved by using interbody fusion devices to restore anatomic disc space height, increase rates of fusion, and recreate the normal sagittal contour of the lumbar spine.