• Stephen J Lewis, Chandan Mohanty, Aaron M Gazendam, So Kato, Sam G Keshen, Noah D Lewis, Sofia P Magana, David Perlmutter, and Jennifer Cape.
• Division of Orthopaedic Surgery, Toronto Western Hospital, University Health Network, 399 Bathurst Street, Room 442, First Floor, East Wing, Toronto, ON, M5T 2S8, Canada. stephen.lewis@uhn.ca.
• Eur Spine J. 2018 Mar 1; 27 (3): 636-643.

PurposeTo determine the incidence of pseudarthrosis at the osteotomy site after three-column spinal osteotomies (3-COs) with posterior column reconstruction.Methods82 consecutive adult 3-COs (66 patients) with a minimum of 2-year follow-up were retrospectively reviewed. All cases underwent posterior 3-COs with two-rod constructs. The inferior facets of the proximal level were reduced to the superior facets of the distal level. If that was not possible, a structural piece of bone graft either from the local resection or a local rib was slotted in the posterior column defect to re-establish continual structural posterior bone across the lateral margins of the resection. No interbody cages were used at the level of the osteotomy.ResultsThere were 34 thoracic osteotomies, 47 lumbar osteotomies and one sacral osteotomy with a mean follow-up of 52 (24-126) months. All cases underwent posterior column reconstructions described above and the addition of interbody support or additional posterior rods was not performed for fusion at the osteotomy level. Among them, 29 patients underwent one or more revision surgeries. There were three definite cases of pseudarthrosis at the osteotomy site (4%). Six revisions were also performed for pseudarthrosis at other levels.ConclusionRestoration of the structural integrity of the posterior column in three-column posterior-based osteotomies was associated with > 95% fusion rate at the level of the osteotomy. Pseudarthrosis at other levels was the second most common reason for revision following adjacent segment disease in the long-term follow-up.

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