Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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Sagittal Pelvic Radius in Low-Grade Isthmic Lumbar Spondylolisthesis of Chinese Population

  • Zhao, Yang (Department of Spinal Surgery, The First Affiliated Hospital of Anhui Medical University) ;
  • Shen, Cai-Liang (Department of Spinal Surgery, The First Affiliated Hospital of Anhui Medical University) ;
  • Zhang, Ren-Jie (Department of Spinal Surgery, The First Affiliated Hospital of Anhui Medical University) ;
  • Cheng, Da-Wei (Department of Spinal Surgery, The First Affiliated Hospital of Anhui Medical University) ;
  • Dong, Fu-Long (Department of Spinal Surgery, The First Affiliated Hospital of Anhui Medical University) ;
  • Wang, Jun (Department of Radiology, The First Affiliated Hospital of Anhui Medical University)
  • Received : 2015.06.09
  • Accepted : 2016.02.13
  • Published : 2016.05.01
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Abstract

Objective : To investigate the variation of pelvic radius and related parameters in low-grade isthmic lumbar spondylolisthesis. Methods : Seventy-four patients with isthmic lumbar spondylolisthesis and 47 controls were included in this study. There were 17 males and 57 females between 30 and 66 years of age, including 30 with grade I slippages and 44 grade II slippages; diseased levels included 34 cases on L4 and 40 cases on L5. Thoracic kyphosis (TK), the pelvic radius (PR), the pelvic angle (PA), pelvic morphology (PR-S1), and total lumbopelvic lordosis (PR-T12) were assessed from radiographs. Results : Statistically significant differences were found for the PA, PR-T12, and PR-S1 ($24.5{\pm}6.6^{\circ}$, $83.7{\pm}9.8^{\circ}$, and $25.4{\pm}11.2^{\circ}$, respectively) of the patients with spondylolisthesis and the healthy volunteers ($13.7{\pm}7.8^{\circ}$, $92.9{\pm}9.2^{\circ}$, and $40.7{\pm}8.9^{\circ}$, respectively). The TK/PR-T12 ratios were between 0.15 and 0.75. However, there were no differences in all the parameters between the L4 and L5 spondylolysis subgroups (p>0.05). The TK and PR-S1 of grade II were less than grade I, but the PA was greater. The PR-T12 of female patients were less than male patients, but the PA was greater (p<0.05). Conclusion : Pelvic morphology differed in patients with low-grade isthmic lumbar spondylolisthesis compared to controls. Gender and the grade of slippage impacted the sagittal configuration of the pelvis, but the segment of the vertebral slip did not. Overall, the spine of those with spondylolisthesis remains able to maintain sagittal balance despite abnormal pelvic morphology.

Keywords

References

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