a spinal implant having a series of sections or units hinged together and a balloon connected to at least some of the sections , the balloon having a curved configuration . the implant has a first delivery configuration and a second curved placement configuration , wherein it has a more linear configuration in the first delivery configuration than in the second curved configuration . the implant assumes the first delivery configuration during delivery to the disc space and maintains the curved configuration after placement within the disc space . the curved configuration can result from filling or expanding the balloon .