title: Negative extension sign in a patient with a herniated lumbar disc.
authors.forename: P
authors.initials: P
authors.lastname: Brien
authors.forename: M J
authors.initials: MJ
authors.lastname: Brien
mesh_terms: D005081:Exercise Therapy; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000503:physiopathology / Q000628:therapy*; D008159:Lumbar Vertebrae