Vertebral Augmentation and Percutaneous Fixation for Thoracolumbar Burst Fractures Requiring Corpectomy (EXVERCOR)

Burst fractures account for approximately 17% of thoracolumbar fractures occurring after high-energy trauma. They are characterized by collapse of the anterior column, leading to loss of vertebral height and a local kyphotic deformity. Involvement of the middle column is a key factor in mechanical instability and largely explains the neurological risk, thus giving burst fractures a particular status among thoracolumbar injuries

In the 1990s, McCormack developed the Load Sharing Classification (LSC) to guide treatment strategy. A score below 7 supported isolated posterior fixation, whereas a score of 7 or higher led to the recommendation of a more invasive approach, including upfront corpectomy combined with supplementary anterior grafting to prevent early construct failure . Grobost demonstrated that corpectomies performed upfront yielded better functional outcomes than those performed secondarily in the context of pseudarthrosis . Although corpectomies provide reliable restoration of the anterior column, they are associated with significant morbidity, prompting the search for less invasive alternatives capable of restoring vertebral height and kyphosis while limiting complications.

Today, newer minimally invasive techniques allow reduction of vertebral height loss and local kyphosis while decreasing the mechanical load on posterior instrumentation . The systematic need for a major anterior procedure (grafting or corpectomy) may therefore be reconsidered. Among these techniques, vertebral expansion devices such as SpineJack have demonstrated the ability to effectively restore vertebral body height and maintain correction over time, particularly when combined with short posterior fixation.

Since 2005, publications on burst fractures have been predominantly limited to meta-analyses, with few new clinical series. Furthermore, available studies mainly focus on fractures of moderate severity, resulting in a lack of data on more severe fractures with an LSC score ≥ 7.

The aim of this study is to evaluate the clinical and radiological outcomes of patients treated at Grenoble Alpes University Hospital for thoracic and lumbar spine burst fractures with a Load Sharing Classification (LSC) score ≥7, managed with vertebral augmentation and percutaneous fixation.

Our hypothesis is that the combined use of percutaneous posterior fixation and anterior vertebral augmentation provides satisfactory clinical and radiological outcomes, thereby avoiding the need for corpectomy in thoracolumbar burst fractures (LSC ≥7).

DESIGN OF THE STUDY :Descriptive, single-center, observational cohort study, both retrospective and prospective, without a control group.