A spinal fusion implant assembly for spacing vertebrae and method of using the implant are provided. The implant includes two components each having a vertebral contact surface, a pair of side portions, and an end plate. The two components are complementary such that when placed together they form a...http://www.google.es/patents/US5865848?utm_source=gb-gplus-sharePatente US5865848 - Dynamic intervertebral spacer and method of use
