[Biomechanical analysis of the correlation between sacral tilt displacement and L₅S₁ disc degeneration]

To biomechanical analysis of the correlation between sacral tilt displacement and L₅-S₁ disc degeneration.

From July 2011 to July 2013, 81 patients with lumbar disc herniation and sacroiliac joint disorder including 45 males and 36 females with an average age of (45.39±1.30) years ranging from 18 to 65 years old were selected. The course of the disease ranged from 1 to 144 months with an average of (12.64±2.19) months. All patients were taken lumbar spine lateral X-ray films, the lumbar curvature angle, L₄-L₅ or L₅-S₁ intervertebral gap distance between points, and the lumbosacral angle was measured and correlated analyzed.

The lumbar curvature of female patients with L₅S₁DH were significantly larger than male patients [(22.18±8.62)° vs (16.17±4.97)°, P<0.05]. Lumbar curvature and lumbosacral angle showed a positive correlation in LDH (R=0.48, P<0.01,y=7.25+0.38x, P<0.01); Male patients with L₄-₅DH were more obvious (R=0.55, P<0.05, y=5.80+0.43x, P<0.01); Female patients with L₅S₁DH were particularly evident(R=0.74, P<0.01,y=0.91x-5.30, P<0.01). The lumbosacral angle and L₄-₅ intervertebral gap was a positive correlation in L₄-₅DH(R=0.27, P<0.05); While L₅-S₁ intervertebral gap and lumbosacral angle were not correlated(P>0.05) in L₅S₁DH.

The sacral tilt displacement and L₅-S₁ disc degeneration were closely related to provide a new understanding philosophy and therapeutic approach for clinical treatment of intractable lumbar L₅S₁DH.