title: [Minimal invasive internal fixation with U-shaped break-off pedicle screws for treatent of thoracolumbar fractures].
abstract: OBJECTIVE
  To investigate the clinical outcome of minimal invasive internal fixation with U-shaped break-off pedicle screws through paraspinal muscle sparing approach to treat thoracolumbar fractures, and to discuss its advantages.
  
  
  METHODS
  From August 2010 to June 2012, we had 40 thoracolumber fractures patients (27 males and 13 females). Their ages ranged from 22 to 60 years. Of the 40 cases, 4 were T11 fractures, 13 T12 fractures ,17 L1 fractures,6 L2 fractures. According to Denis classification,all of them were burst fractures, with vertebral canal compromise less than 1/3. According to AO classification they were type A or type B1 injuries. All the cases had no nerve injury. The patients were randomly divided into two groups. With Group A (20 cases) we took the method of minimal invasive internal fixation with U-shaped break-off pedicle screws to fix one level above and below the injured vertebra through the parespinal muscle sparing approach. With Group B (20 cases), we took the traditional posterior midline approach and open procedure. Then we compared the two groups by operation time, blood loss, drainage, Visual Analogue Scales and X-ray exposure.
  
  
  RESULTS
  Minimal invasive group had obvious advatages in operation time, bleeding control and early pain relief of post-operation. The X-ray exposure and long-term follow-up outcome were almost the same.
  
  
  CONCLUSIONS
  Through paraspinal muscle sparing approach minimal invasive internal fixtation with U-shaped break-off pedicle screws to treat thoracolumber has more advantages than traditional procedure in blood control and quick recovery. The method needs no special instruments and don't increase X-ray exposure.
authors.affiliation: Department of Trauma and Orthopeadics, Peking University People's Hospital;Peking University Traffic Medicine Center, Beijing 100044, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Xue
authors.forename: Zhong-Guo
authors.initials: ZG
authors.lastname: Fu
authors.forename: Dian-Ying
authors.initials: DY
authors.lastname: Zhang
authors.forename: Pei-Xun
authors.initials: PX
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Zhou
authors.forename: Bao-Guo
authors.initials: BG
authors.lastname: Jiang
mesh_terms: D000328:Adult; D016063:Blood Loss, Surgical; D001863:Bone Screws; D005260:Female; D005593:Fracture Fixation, Internal / Q000379:methods*; D006801:Humans; D016268:Internal Fixators; D008159:Lumbar Vertebrae / Q000293:injuries*; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000379:methods*; D061646:Operative Time; D010147:Pain Measurement; D064170:Paraspinal Muscles / Q000601:surgery; D016103:Spinal Fractures / Q000601:surgery*; D013904:Thoracic Vertebrae / Q000293:injuries*; D055815:Young Adult