| The lumbar disc and bilateral zygapophyseal joints play an very important role in the stability of lumber spine. They form the tri-joint complex (TJC) . The zygapophyseal joint bears different types of compression, traction, shearing and torsion load, and provides some physiological movement for lumbar spine. Lumbar disc herniation (LDH) is a common disease in spinal disorders. There are two major surgical interventions at present for treating LDH: discectomy and fusion. The balance of TJC was broken and the bearing style of functional spinal unit (FSU) was changed after disc excision, which lead to secondary instability of spine. The loss of intervertebral space height after discectomy is disadvantageous to the zygapophyseal joint and is one of the important reason of symptomatic recurrence or continued back pain. Spinal segmental fusion is an important method for treatment of instable back pain, but fusion itself is not a physiological method. The fusion rate is only 75%-80% and has high pseudarthrosis incidence rate. The segments of fusion lose movement function. Fusion disturbs normal mechanics conduction, increases the stress of adjacent segment, and accelerates degeneration of adjacent disc. In theory, discectomy and fusion are the direct means to alleviate symptom, and they all don't solve fundamental question: the loss of disc function. The best approach is to develop an instrument or a therapeutic method to accord with the disc...
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