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Multiple three-column osteotomies successfully correcting cervicothoracic kyphosis in the setting of ankylosing spondylitis: illustrative case

Luke Mugge, Paul Gorka, Cristie Brewer, and Brian McHugh

significant for AS, which had been diagnosed 15 years prior. He also had a diagnosis of osteoporosis with a T-score of 2.7 and was being treated with Voltaren and Fosamax. His chin-brow angle was 0°. Neurologically, the patient was intact and without balance issues. Preoperative radiographs ( Fig. 1 ) and radiographic measurements were as follows: pelvis and shoulders were level; pelvic incidence (PI) was 59.3°; pelvic tilt (PT), 38.2°, lumbar lordosis (LL), 5.0°; and sacral slope (SS), 20.7°. Chin-brow vertical angle (CBVA) was 58.0°; T1 slope (T1S), 97.8°; thoracic