There is a high probability of mechanical complications in patients with degenerative lumbar scoliosis after long segment fixation and fusion, and there are few studies on distal borderline kyphosis deformity/failure. This study was designed to retrospectively analyze the patients with degenerative lumbar scoliosis (DLS) who underwent posterior selective decompression and long segment fixation and fusion surgery in the lumbar spine department of our hospital from April 2009 to May 2016. Patients' basic data, surgical data and preoperative, immediate postoperative and follow-up imaging data were collected to study the incidence of distal mechanical complications, risk factors and their relationship with clinical symptom scores in DLS patients undergoing posterior selective decompression and long segment fixation and fusion. It has guiding significance for clinical operation decision making.

Inclusion Criteria:

• Age ≥45 years old;
• The number of fixed vertebral bodies ≥5, and the upper instrumented vertebra (UIV) is located in the thoracolumbar segment;
• Third generation total pedicle screw internal fixation system;
• Follow-up time ≥24 months;
• Complete clinical and imaging data.

Exclusion Criteria:

• Idiopathic scoliosis, neuromuscular scoliosis, non-structural scoliosis, spinal tumors, spinal tuberculosis, ankylosing spondylitis, humman's disease, history of spinal surgery, history of spinal trauma, and history of hip surgery

From April 2009 to May 2019, patients with degenerative lumbar scoliosis (DLS) underwent posterior selective decompression and long segment fixation and fusion surgery in the Department of Orthopaedic Lumbar Surgery of our hospital