This animation depicts a posterior interbody and posterolateral arthrodesis at L4-5. The surgical steps include the following; incision site over L4-5, dissection of paraspinal musculature at L4-5, excision of spinous processes, laminectomy, bilateral facetectomy, bilateral nerve root decompression, preoperative MRI depicting the left foraminal disc herniation with annular tear, discectomy, excision of cartilaginous end plates, impaction of two PEEK cages with allograft into L4-5 disc space, decortication of transverse processes, placement of pedicle screws into L4 & L5, posterolateral fusion of L4-5 with rods, pedicle screw caps and mixed bone, placement of mixed bone graft fusion.

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