History of lumbar spinal fusion, evaluate sagittal balance. Views of the spine demonstrate posterior stabilization rods with screws entering L4, L5, and S1. There is rightward curvature of the lumbar spine (though precise angles are difficult to measure due to partial obscuration of the lumbar spine on the frontal view). At least mild-moderate multilevel degenerative changes are present most prominent in the lumbar spine. The coronal balance measures approximately -6 cm. The sagittal balance measures approximately +16 cm.
Postoperative changes and balances as described above.