The embodiments provide various interbody fusion spacers, or cages, for
insertion between adjacent vertebrae. The cages may have integrated
ratchet assemblies that allow the cage to
change size and angle as needed, with little effort. The cages may have a first,
insertion configuration characterized by a
reduced size to facilitate
insertion through a narrow access passage and into the
intervertebral space. The cages may be inserted in a first,
reduced size and then expanded to a second, larger size once implanted. In their second configuration, the cages are able to maintain the proper
disc height and stabilize the spine by restoring sagittal balance and alignment. Additionally, the intervertebral cages are configured to be able to adjust the angle of
lordosis, and can accommodate larger lordotic angles in their second, expanded configuration. Further, these cages may promote fusion to further enhance spine stability by immobilizing the adjacent vertebral bodies.