RESUMEN
Objective To investigate the risk factors of proximal junctional kyphosis (PJK) after posterior long segmental lumbar fusion for degenerative lumbar disease. Methods From October, 2012 to July, 2014, 118 degenerative lumbar disease patients who accepted posteri-or long segmental fusion and followed up at least 1.5 years were reviewed. All the PJK were evaluated with X-ray. Results Sixty-six pa-tients completed the follow-up (mean of 3.2 years), in which 12 patients with PJK (PJK group), and the others without (non-PJK group, n=54). There was significant difference in body mass index, bone density and the last Oswestry Disability Index scores (t>2.194, P3.862, P10° (OR=5.789, 95%CI:1.075~31.183) were the independent risk factors of PJK. Conclusion Osteoporosis, UIV located in the thoracolumbar segment (T11-L1) and the pre-surgery PJK angle>10° are risk factors of PJK af-ter posterior long segmental lumbar fusion.