title: Spinal instability.
authors.forename: R J
authors.initials: RJ
authors.lastname: Hacker
authors.forename: S J
authors.initials: SJ
authors.lastname: McGirr
mesh_terms: D001863:Bone Screws / Q000592:standards*; D006801:Humans; D007593:Joint Instability / Q000601:surgery*; D017116:Low Back Pain / Q000601:surgery*; D008875:Middle Aged; D012086:Reoperation; D013122:Spinal Diseases / Q000601:surgery*; D013123:Spinal Fusion