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  • Risk factors for supplementary posterior instrumentation after anterolateral decompression and instrumentation in thoracolumbar burst fractures

    Final Number:

    Andrew James Grossbach MD; Wenzhuan He MD, MS; Toshio Moritani MD, PhD; Patrick W. Hitchon MD

    Study Design:
    Clinical Trial

    Subject Category:

    Meeting: Congress of Neurological Surgeons 2014 Annual Meeting

    Introduction: The anterolateral approach for spinal decompression and stabilization is a time proven method for the treatment of burst fractures. However, some patients treated with this approach have required supplementary posterior instrumentation. There are no rigid criteria when to undertake supplementary posterior instrumentation after the anterolateral approach.

    Methods: Seventy-three patients underwent anterolateral decompression and instrumentation. Clinical and radiographic data were collected prospectively and reviewed retrospectively.

    Results: Surgery was undertaken in 46 patients with neurological deficit and in 27 who were intact. The mean age was 42±17 years, with 49 males and 24 females. The majority of injuries were due to falls, followed by motor vehicular accidents. L1 was the affected level in 31, followed by T12 in 18. The posterior ligamentous complex (PLC) was assessed on magnetic resonance imaging (MRI) in 38 patients. It was deemed disrupted in 10, 4 of whom were intact and 6 with deficit. The residual spinal canal in the 28 patients with intact PLC was not different from that in the 10 with disrupted PLC (44±17 vs. 42±10, p=0.742). Kyphosis on admission in patients with intact and disrupted PLC measured 6.2±9.5º and 7.3±10.9° respectively (p=0.74). Supplemental posterior instrumentation was performed in 7/73 patients, 3 with disrupted PLC and 4 with intact PLC (NS). The age of patients requiring supplemental posterior instrumentation (59±14 years) exceeded that of patients who did not (41±16, p=0.004).

    Conclusions: Supplemental posterior instrumentation was deemed necessary in 10% of cases following anterolateral decompression and instrumentation for thoracolumbar burst fractures. Age was the only significant risk factor predicating supplemental posterior instrumentation.

    Patient Care: Our research will improve patient care by helping to identify those who may benefit from supplementary posterior instrumentation vs anterior instrumentation alone.

    Learning Objectives: By the conclusion of this session, participants should be able to 1) Describe the analysis of thoracolumbar burst fractures, 2) Discuss in small groups the advantages and disadvantages of anterior approaches to the thoracolumbar spine, and 3) Identify which patients may benefit from supplementary posterior instrumentation.

    References: 1. Machino M, et al. Posterior/anterior combined surgery for thoracolumbar burst fractures - posterior instrumentation with pedicle screws and laminar hooks, anterior decompression and strut grafting. Spinal Cord. 2011;49:573-9. 2. Ramani PS, et al. Combined anterior and posterior decompression and short segment fixation for unstable burst fractures in the dorso lumbar region. Neurology India. 2002;50(3):272-8. 3. McDonough PW, et al. The management of acute thoracolumbar burst fractures with anterior corpectomy and z-plate fixation. Spine. 2004;29(17):1901-8.

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