Significance of the Posterior Fusion Mass Bone Density for the Onset of Mechanical Complications After a Thoracolumbar Three-Column Osteotomy in Adult Spinal Deformity Patients.

Patients with PJK tend to have less dense posterior fusion mass at the UIV. Fusion mass density does not correlate with RF, but greater bone density near the osteotomy was correlated with accompanying pseudarthrosis in patients with RFs. Assessing density of posterior fusion mass on CT may be helpful in assessing risk for PJK and provide insight as to the causes of RFs.