L4-S1 Posterior Lumbar Interbody Fusion (PLIF)This trial exhibit graphically depicts L4 S1 Posterior Lumbar Interbody Fusion (PLIF), shown from the lateral and posterior views. The medical illustrations in this exhibit show the residual hardware of the pedicle screws and rods inserted into the lumbar spine vertebrae at the L4, L5 and S1 levels. An intervertebral allograft is also shown placed for interbody fusion between the L4 L5 and L5 S1 vertebrae, with descriptive labels of hardware and