The significance of the anatomical factors in the occurrence of degenerative lumbar spondylolisthesis

English Keywords:Degenerative lumbar spondylolisthesis  Lumbar lordosis  Lumbar index  Disc height

English Abstract:

  【Abstract】 Objectives: To analyzed the risk factors of degenerative lumbar spondylolisthesis(DLS). Methods: Retrospectively reviewed 60 cases of DLS patients as the case group, from July 2009 to September 2010. Male 20 cases, female 40 cases, age 51-75 years old, averaged 65.3±7.8 years old. Enrolled 60 cases age- and sex-matched volunteers without DLS as the control group. The lumber lordosis angle(LLA), sacral horizontal angle(SHA), lumbar index(LI), disc angle(DA), disc height(DH) were measured on the lateral radiograph film and the length of transverse process of L5(TPL), the width of transverse process of L5(TPW) were measured on the anterior-posterior radiograph film. The LI, DA, DH of the control group were the parameter of vertebral and disc, which were corresponding to the slippage level of the case group. Examined the differences of these variables between groups and the association between DLS and these variables. Results: LLA, SHA, LI, DA, DH of the case group were 45.83°±10.42°, 28.35°±11.16°, 0.85±0.13, 7.24°±3.83°, 9.12±2.73mm, and the control group were 47.48°±10.75°, 23.16°±10.68°, 0.96±0.10, 9.68°±5.54°, 10.54±2.48mm. SHA, LI, DA, DH had significant differences between groups(P<0.05). TPL, TPW of the case group were 2.15±0.43cm, 1.64±0.41cm, and TPL, TPW of the control group were 2.06±0.39cm, 1.57±0.32cm. There was no significant difference between groups(P>0.05). Logistic regression analysis showed statistically significant associations between DLS and LI, DA. The regression coefficients of LI and DA were －1.693、－1.406. Conclusions: DLS is significantly correlated with LI and DA. The decline of LI and DA may be the risk factors of DLS.