Biomechanical effects of fusion levels on the risk of proximal junctional failure and kyphosis in lumbar spinal fusion surgery
Background Spinal fusion surgery is a widely used surgical procedure for sagittal
realignment. Clinical studies have reported that spinal fusion may cause proximal junctional
kyphosis and failure with disc failure, vertebral fracture, and/or failure at the implant-bone
interface. However, the biomechanical injury mechanisms of proximal junctional kyphosis
and failure remain unclear. Methods A finite element model of the thoracolumbar spine was
used. Nine fusion models with pedicle screw systems implanted at the L2–L3, L3–L4, L4 …
realignment. Clinical studies have reported that spinal fusion may cause proximal junctional
kyphosis and failure with disc failure, vertebral fracture, and/or failure at the implant-bone
interface. However, the biomechanical injury mechanisms of proximal junctional kyphosis
and failure remain unclear. Methods A finite element model of the thoracolumbar spine was
used. Nine fusion models with pedicle screw systems implanted at the L2–L3, L3–L4, L4 …
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