Significance of chin-brow vertical angle in correction of kyphotic deformity of ankylosing spondylitis patients

Kyung Soo Suk, Ki Tack Kim, Sang Hun Lee, Jin Moon Kim

Research output: Contribution to journalArticle

Abstract

Study Design. A prospective study. Objectives. To assess the significance of chin-brow vertical angle in planning and evaluating the correction of kyphotic deformity with ankylosis of the cervical spine in ankylosing spondylitis patients. Summary of Background Data. Accurate assessment and measurement of spinal kyphotic deformity is required when planning treatment and assessing its results. Methods. Thirty-four ankylosing spondylitis patients with cervical ankylosis who had undergone pedicle subtraction extension osteotomy for correction of kyphotic deformity were studied. Radiographic assessment for sagittal balance was performed by measuring thoracic kyphosis, lumbar lordosis, the distance between the vertical line on the anterosuperior point of T1 and that of S1, and sacral inclination. Chin-brow vertical angle was measured on the clinical photos of the patients. Clinical outcomes were assessed by a questionnaire. Results. The preoperative and postoperative chin-brow vertical angles were 35.5° and 1.8°, respectively. Final follow-up radiographs showed an increase in lumbar lordosis from 5.5° to 43.2° (an increase of 37.7°), and thoracic kyphosis remained stable from 50.4° to 50.2°. Sagittal imbalance significantly improved from 101.5 mm to 12.7 mm. The decreased chin-brow vertical angle correlated negatively with the correction angle. The patients with a chin-brow vertical angle of less than -10° had significantly low scores on horizontal gaze. Conclusions. Chin-brow vertical angle was an objective index for evaluating horizontal gaze. Based on the results of this study, measurement of chin-brow vertical angle is recommended for planning correction of kyphosis and accurate evaluation of treatment outcome.

Original languageEnglish (US)
Pages (from-to)2001-2005
Number of pages5
JournalSpine
Volume28
Issue number17
DOIs
StatePublished - Sep 1 2003

Keywords

  • Ankylosing spondylitis
  • Cervical ankylosis
  • Chin-brow vertical angle
  • Correction osteotomy
  • Kyphotic deformity

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Clinical Neurology

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