title: L4-5 degenerative spondylolisthesis in monozygous twins.
abstract: OBJECTIVE
  The author reports symptomatic spinal canal stenosis due to degenerative spondylolisthesis at L4-5 in identical twins.
  
  
  BACKGROUND
  The patient reported his brother had a similar condition.
  
  
  METHODS
  Monozygosity was established by phenotyping.
  
  
  CONCLUSIONS
  Spinal morphology and degenerative disease may be genetically determined.
authors.affiliation: Department of Orthopaedics and Traumatic Surgery, The University of Sydney Royal North Shore Hospital of Sydney, St. Leonards, Australia.
authors.forename: M D
authors.initials: MD
authors.lastname: Ryan
mesh_terms: D000368:Aged; D004200:Diseases in Twins / Q000235:genetics*; D006801:Humans; D008159:Lumbar Vertebrae / Q000000981:diagnostic imaging*; D008297:Male; D011859:Radiography; D013168:Spondylolisthesis / Q000000981:diagnostic imaging / Q000235:genetics*; D014430:Twins, Monozygotic