The impact of preoperative cervical degeneration on proximal junctional kyphosis in adult spinal deformity surgery with an upper-thoracic upper instrumented vertebra.
OBJECTIVE Preoperative cervical malalignment, including an increased cervical sagittal vertical axis and proximal junctional angle (PJA), has been associated with proximal junctional kyphosis (PJK) following thoracolumbar deformity correction. However, the influence of cervical disc degeneration on PJK risk remains unc...