Hossein Mehdian1, Ranganathan Arun2, Nick A Aresti3. 1. Centre for Spinal studies and Surgery, D Floor, West Block, Queens Medical Centre, Derby Rd, Nottingham NG7 2UH, UK. 2. Barts Health, Royal London Hospital, Whitechapel Rd, London E1 1BB, UK. Electronic address: arearoon@yahoo.com. 3. Barts Health, Royal London Hospital, Whitechapel Rd, London E1 1BB, UK; Percivall Pott Rotation, Royal London Hospital, Whitechapel Rd, London E1 1BB, UK.
Abstract
BACKGROUND CONTEXT: Fixed sagittal plane imbalance (FSI) has traditionally been corrected by either opening or closing wedge osteotomies or vertebral column resections. These methods involve multiple vertebrae and have been associated with limited degrees of correction and/or neurovascular compromise. PURPOSE: We describe a new V-Y vertebral osteotomy (VYO) that involves a single vertebra, allowing for correction of all three columns in a safer fashion. STUDY DESIGN: A prospective assessment of the degree of correction pre- and post-VYO in a tertiary spinal center. PATIENT SAMPLE: Ten consecutive patients presenting with sagittal plane imbalance were enrolled in this study. OUTCOME MEASURES: Outcomes were assessed with pre- (preop) and postoperative (postop) outcome questionnaires (Oswestry Disability Index [ODI] and Scoliosis Research Society-24) and radiography. METHODS: Ten patients underwent VYO at L3 with varying levels of instrumentation. The procedure involves a V-shaped osteotomy in the sagittal plane, sparing the anterior 50% of the body, the apex of which is then converted to a Y shape, and the osteotomy closed. RESULTS: Patients were followed for a mean of 36 months (24-48 months). The procedure led to significant improvements in sagittal balance, lumbar lordosis, thoracic kyphosis, coronal balance, sacral inclination, and pelvic incidence. The average degree of correction achieved was 44.58°±6.19° (mean±standard deviation). The mean blood loss was 1,287±350 mL and the operative time was 220±24 minutes. The mean preop ODI was 72% (range 58%-85%) and postop ODI averaged 22% (range 10%-30%). The mean preop SRS-24 score was 30.1 and postop was 101. CONCLUSIONS: The VYO provides a safe correction of up to 45° at a single osteotomy site in FSI patients. It involves an isolated posterior approach and is recommended for corrections below the region of the conus.
BACKGROUND CONTEXT: Fixed sagittal plane imbalance (FSI) has traditionally been corrected by either opening or closing wedge osteotomies or vertebral column resections. These methods involve multiple vertebrae and have been associated with limited degrees of correction and/or neurovascular compromise. PURPOSE: We describe a new V-Y vertebral osteotomy (VYO) that involves a single vertebra, allowing for correction of all three columns in a safer fashion. STUDY DESIGN: A prospective assessment of the degree of correction pre- and post-VYO in a tertiary spinal center. PATIENT SAMPLE: Ten consecutive patients presenting with sagittal plane imbalance were enrolled in this study. OUTCOME MEASURES: Outcomes were assessed with pre- (preop) and postoperative (postop) outcome questionnaires (Oswestry Disability Index [ODI] and Scoliosis Research Society-24) and radiography. METHODS: Ten patients underwent VYO at L3 with varying levels of instrumentation. The procedure involves a V-shaped osteotomy in the sagittal plane, sparing the anterior 50% of the body, the apex of which is then converted to a Y shape, and the osteotomy closed. RESULTS:Patients were followed for a mean of 36 months (24-48 months). The procedure led to significant improvements in sagittal balance, lumbar lordosis, thoracic kyphosis, coronal balance, sacral inclination, and pelvic incidence. The average degree of correction achieved was 44.58°±6.19° (mean±standard deviation). The mean blood loss was 1,287±350 mL and the operative time was 220±24 minutes. The mean preop ODI was 72% (range 58%-85%) and postop ODI averaged 22% (range 10%-30%). The mean preop SRS-24 score was 30.1 and postop was 101. CONCLUSIONS: The VYO provides a safe correction of up to 45° at a single osteotomy site in FSI patients. It involves an isolated posterior approach and is recommended for corrections below the region of the conus.
Authors: Andrea Zanirato; Marco Damilano; Matteo Formica; Andrea Piazzolla; Alessio Lovi; Jorge Hugo Villafañe; Pedro Berjano Journal: Eur Spine J Date: 2018-03-01 Impact factor: 3.134