Jack dilator-kyphoplasty for osteoporosis thoracolumbar compression fractures

English Keywords:Thoracolumber vertebral compression fracture  Osteoporosis  Kyphoplasty  Vertebral dilator

English Abstract:

  【Abstract】 Objective：To investigate the clinical outcome of Jack dilator-kyphoplasty（DKP） for osteoporosis thoracolumbar compression fracture.Method：According to the anatomical measurement of the pedicles，a rectangular-shaped bone dilator was designed with the mechanism of expanding dilator head parallelly.71 vertebraes from 71 cases（19 males and 52 females，age range，48-82 years old） were received DKP from October 2006 to February 2010.The injured vertebrae included 3 in T11，22 in T12，23 in L1，16 in L2，5 in L3 and 2 in L4.The visual analogue scale（VAS） score，Oswestry disability index（ODI），the mean anterior，midline vertebral height and kyphosis Cobb′s angle were determined before and after operation or at follow-up.Result：Obvious back pain relief in all patients after operation was noted.No intraoperative complications were documented except bone cement leakage laterally in 2 vertebrae.The VAS score was 7.9±0.7 before operation and decreased to 2.0±0.6 three months after operation（P<0.01）.The ODI was （73.9±11.3）% before operation and decreased to （21.5±5.2）% three months after operation（P<0.01）.The mean anterior and midline vertebral height were 19.3±3.0mm and 19.1±3.3mm respectively before operation which increased to 25.5±3.2mm and 25.3±2.7mm respectively three months after operation（P<0.01）.The kyphosis angle was 17.8°±4.9° before operation and decreased to 8.7°±5.0° three months after operation（P<0.01）.Conclusion：DKP has the effect of restoring the anterior and the midline vertebral height，correcting kyphosis Cobb′s angle and good pain relief.