The main reason for change of cervical physiological curve is not intervertebral disc degeneration, but the degeneration of muscular function. There are 2 main reasons as follows: firstly, working with lowing head causes muscular chronic strain. Secondly, the muscular tension and maintenance energy of cervical vertebra gets weaker, and then leads to disorder of biomechanics function of cervical vertebra system, loosing of stability of cervical vertebra and hard to keep inherent balance. When the self-correction function of organism and self-recover ability can not satisfy the compensation and normal physiologic function which is necessary for degeneration, the physiological curve will changed to satisfy the physiological activities. When the physiological curve changes, the inherent balance is damaged. In order to keep the function of cervical vertebra, the strengths among every tissue must redistribute, that is compensation of self-functions and rebuilding of new balance which are finished by muscular tissue. When the compensation requirements are overrun the compensation of cervical vertebra, muscular convulsion, congestion, edema, etc will be caused, and then a series of neck pains occur. Secondly, when the physiological curve get straight, intervertebral disc and lesser joints afford more pressures, stability reduce, carrying capacity gets weaker, degeneration accelerate and hyperplasia will also occur sequentially. Moreover, after cervical physiological curve gets straight, the path of vertebral artery which runs through cervical foramina changes, blood supply of arteriae basilaris gets insufficient by traction and compression and the nutrition of cranial nerve reduces, and thereby the syndromes resembling vertebral artery type cervical spondylosis such as dizziness, poor memory, insomnia, tinnitus and eye swelling, etc are caused.
Key words: cervical physiological curve, straighten
Writer: Li Wang, Lixin Zhao, Yajun Du, Xinmei Liu
Traditional Chinese medicine academy of Shanxi province (030012)
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