Hemimetameric segmental shift: a case series and review.

Scott B. Shawen, Philip J. Belmont, Timothy R. Kuklo, Brett D. Owens, Kenneth Taylor, Richard Kruse, David W. Polly

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

STUDY DESIGN: A case series of patients with hemimetameric shift. OBJECTIVES: To describe the radiographic and physical findings as well as treatment provided to a subset of patients with congenital scoliosis. SUMMARY OF BACKGROUND DATA: Hemimetameric segmental displacement, or hemimetameric shift, is a clinical entity defined by two contralateral hemivertebrae separated by at least one normal vertebra. Although the entity is briefly described in textbooks, there are no published series to date. METHODS: From 1974 to 2000, 186 cases of congenital scoliosis were identified from two referral centers. Of these, 27 cases (15%) of hemimetameric shift were identified. Medical records and radiographs were reviewed, as well as magnetic resonance imaging when available. RESULTS: There were an average of 2.9 hemivertebrae per patient (range 2-6) with the following distribution: T1-T6 (29), T7-T11 (28), T12-L1 (10), L2-L4 (11), and L5 (1). The average curve magnitude at presentation was 28 degrees (range 9 degrees -55 degrees). Nine patients required surgery-most commonly with involvement of the thoracolumbar or lumbosacral junction. Eleven patients also had associated anomalies to include Klippel-Feil syndrome (3), Goldenhar syndrome (2), imperforate anus (2), tracheoesophageal fistula (2), and a single kidney (2). There was only one patient who had an abnormal magnetic resonance imaging (1 out of 17; 6%). CONCLUSIONS: Hemimetameric shift is a common finding in congenital scoliosis. Hemivertebrae are most commonly found in the thoracic spine; however, surgical intervention is most commonly observed when the caudal hemivertebrae is located from the thoracolumbar to lumbosacral junction. The incidence of abnormal magnetic resonance imaging findings is low (6%).

Original languageEnglish (US)
JournalSpine
Volume27
Issue number24
StatePublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Clinical Neurology

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