| Cervical vertebra lability , especially the lower cervical vertebra in this artical, is the main reason for vertigo produced by neck .There are a lot of methods to treat this vertigo. PLDD has demonstrated striking effect as a tiny trauma technique. In this experiment we observed 32 patients who suit PLDD and have cervical protrusion. We collected 32 patients whose age is between 30 years old and 67 years old, the average age is 53 years old, their main symptoms is vertigo and tinnitus, and some of them have numbness or dull pain in the neck, shoulder and back. We ranged these patients into three groups according to their age: S group has nine patients whose age are between 30 years old and 40 years old.; P group has 23 patients whose age between 40 years old and 67 years old. Before PLDD we excluded some reasons for vertigo such as Ear nose roar disease and the nerve internal medicine disease. By comparing the lateral photograph of abnormal cervical vertebra and the dynamic lateral photograph we can found out the changes of the angle migration, the horizontal displacement and the height of intervertebral space .Method: We fix a plastic ruler adhered a ten-centiliter-long lead bar to a rubber support, we can adjust the distance of ruler in order to make the lead bar perpendicular to horizontal plane in photographing; At the same time we kept the lead bar in the surface of the central line of the anterior part of neck, thus all is under the same condition.After that, we traced the length of every lead ruler, and divided them into ten parts, each part is one centiliter, using this ruler to measure the horizontal displacement of adjacent vertebra, the angle displacement and the height of the intervertebral space in the same photo. Choose the same patient's result of the third day and the 28th day as auto-control and make statistics analysis.If the distance of the adjacent posterior border of vertebra is more than 3.5mm, it means this vertebra is not steady, if the angle displacement in rest position is larger than 110 and in dynamic position more than 20 0.it also means the vertebra is unstable.If the measured value of the intervertebral space is no more than 4.0mm,it means that the height of vertebral body is reduced,otherwise it is in the normal scope.Before PLDD,the measure result shows: the abnormal cervical vertebra of 32 patients demonstrated horizontal displacement which is more than 3.5mm,and the angle displacement between the gap of adjacent vertebra is larger than 110 in rest position,and in the dynamic lateral position is larger than 200 .On the third day of PLDD, the measure result shows: The horizontal displacement of the adjacent abnormal vertebra gap increases, so it is with the angle displacement but the altitude of the adjacent vertebra gap reduces. Which suggestes that the cervical lability aggravates. On the 28th day of neck support, the result shows: The horizontal displacement of adjacent vertebra is no more than 3.5mm, the angle displacement in rest position is smaller than 110. And in the dynamic lateral position is smaller than 200; the height of the intervertebral space does not have obvious changes. Which tells us in 28 days ill vertebras get to stabilize again. By using laser which can produce energy and make most or part nucleus pulposus vaporization, we can ruduce the pressure and volume of intervertebral discs, thus it can alleviate the stimulation and oppression on myelvertebra artery and improve the blood supply of the vertebral-base artery, at last we would reached the purpose of treatment. The healing effect of strong laser arouses different kind of pathology relevant to the type of laser. the damage degree of nucleus pulposus is related to many factors such as the absorption of laser, the distribution of heat, the duty of the laser, the exposure mod, time, area and energy distribution. Collagen in 55~60℃ will denaturate. When in 300~400℃, it arises charring; in more than 500℃, it arises combustion, and in more than 1000℃ arises vapori...
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