Abstract
To compare single-level circumferential spinal fusion using pedicle (n=27) versus low-profile minimally invasive facet screw (n=35) posterior instrumentation. A prospective two-arm cohort study with 5-year outcomes as follow-up was conducted. Assessment included back and leg pain, pain drawing, Oswestry disability index (ODI), pain medication usage, self-assessment of procedure success, and >1-year postoperative lumbar magnetic resonance imaging. Significantly less operative time, estimated blood loss and costs were incurred for the facet group. Clinical improvement was significant for both groups (p<0.01 for all outcomes scales). Outcomes were significantly better for back pain and ODI for the facet relative to the pedicle group at follow-up periods >1year (p<0.05). Postoperative magnetic resonance imaging found that 20% had progressive adjacent disc degeneration, and posterior muscle changes tended to be greater for the pedicle screw group. One-level circumferential spinal fusion using facet screws proved superior to pedicle screw instrumentation.
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