ABSTRACT
Background In osteoporotic vertebral fractures (OVF) involving neurological symptoms and severe kyphosis, vertebral osteotomies are necessary but are associated with a high risk of complications.
Methods We performed a retrospective study. In 14 patients (mean age, 69.3 years old) with unstable thoracolumbar fractures associated with severe kyphosis, a posterior instrumentation with polymethylmethacrylate-augmented screws and a modified pedicle subtraction osteotomy (PSO) at the fracture level were performed to stabilize the spine and correct the kyphosis. The underlying principle behind the osteotomy's technique was to exaggerate the defect caused by the fracture and shorten the spine: (1) completion of a wide laminoforaminotomy, (2) use of successive reamers rotated in the pedicle at a 25° angle in the axial plane to obtain its complete decancellation, (3) insertion of the reamers in a more medial orientation (55°) to collapse the posterior wall, and (4) breakage of the lateral wall. Radiographic and clinical outcomes were analyzed pre- and postoperatively. Complications were reported.
Results Functional scores improved after surgery. Oswestry disability index and visual analog scale scores decreased significantly (33 and 4 points, respectively). Patient satisfaction rate reached 93%. Average postoperative regional vertebral kyphosis was decreased to 3.79°. No dural tear or neurological injuries were observed. Blood loss of 920 mL (±350 mL) and two mechanical complications were reported.
Conclusions OVF can lead to severe deformities. In osteoporotic bones, the use of sequential reamers can simplify the PSO technique, allowing for the shortening and stabilization of the spine without manipulating the dural sac. The risk of neurological injuries and blood loss is decreased.
Level of Evidence 4.
- pedicle subtraction osteotomy
- decancellation technique
- osteoporotic vertebral fractures
- kyphosis
- spine trauma
- osteoporosis
- spinal instability
- complications
Footnotes
Disclosures and COI: This study has not received any financial support. The following are relationships of the authors with organizations and entities (none are related to the present manuscript): Dr Nicolas Plais is a consultant for Medtronic and reports stocks in Nuvasive and Spinewave, Dr Alvarez Galovich is a consultant for Nuvasive, Spineart, and Zimmer-Biomet, and Dr Peiro-Garcia is a consultant for Spineart and Stryker. For the remaining authors, no conflicts of interest were declared.
- This manuscript is generously published free of charge by ISASS, the International Society for the Advancement of Spine Surgery. Copyright © 2021 ISASS