A spinal implant (200) including first spinal attachment member (201) for attaching to a first spinal portion, second spinal attachment member (202) for attaching to a second spinal portion, and a post-implantation variable dimension rod disposed between the first and second spinal attachment members, which is operable after completing surgery in which said spinal implant was installed into a patient, to cause relative movement between the first and second spinal attachment members.
