| [Objective]This research started from the untargeted rotary of manipulation. Taking human cervical sample as study object, utilizing pressure transducer and biomechanics material testing machine, the research measured the effect of different manipulation on the internal nuelcuspulposus pressure of cervical disk and then discussed the principles of manipulation on the treatment of cervical spondylosis. Access to internal nuelcuspulposus pressure changes in value after the operation at the same time evaluate the different securities of manipulations. Through this experimental study, a reasonable approach in all aspects of methodology (angle, speed, intensity, time) data for the rotation of the standardized approach will certainly lay a theoretical foundation for research. [Experimental]The 6 samples come from cervical of the dead body of a healthy young male, who was dead of acute brain death. The cervical samples start from 1.Ocm the top of forame nmagnum and end at T1-2 lumbar disk, which could contain the samples' integrality. All the samples were embedded in the dental base acrylic resin powder. The instruments include data collecting system, pressure sensor, biomechanics material testing machine. The experimental project is as following.(1)The pull strength influenceThree degree:150N,200N,300N.(2)The statement influenceA statement:pull straight upside with 3 different strength and turn right for some angle, then turn back for 15°.B statement:turn right for some angle, pull straight upside with 3 different degree, and turn back for 15°. C statement:pull straight upside with 3 different strength while turn right for some angle, then turn back for 15°.(3) The angle of rotaryThe measurement of rotary angle:fix sample on the MTS and turn right to the most, then fix the top of sample on the MTS. Read data on the MTS.(4) The angle influenceTurn back for 15°.(5) The time influenceThree statements:0.07s,0.11s,0.15s(6) The angles of positionThe flexion and extension:10°,15°,20°.[results]1. Average nuelcuspulposus pressure value of physiological positional knar:C3,4 is 342.08±9.07kPa,C4,5 is 345.44±5.72kPa,C5,6 is 400.95±5.32kPa,C6,7 is 400.39±4.45kPa, C3,4 and C4,5 do not have significant difference, C5,6 and C6,7 do not have significant difference, C3,4, C4,5 and C5,6, C6,7 have significant difference;2. After simulating the pressure of 100N, the average nuelcuspulposus pressure values are shown as following, C3,4 is 363.78±5.86kPa, C4,5 is 363.24±6.96kPa,C5,6 is 439.55±4.53kPa,C6,7 is 440.98±4.45kPa, C3,4 and C4,5 do not have significant difference, C5,6 and C6,7 do not have significant difference, C3,4, C4,5 and C5,6, C6,7 have significant difference. The average nuelcuspulposus pressure decrease has significant difference compared with table 2. However, the pressure of C5,6, C6,7 is higher than that of C3,4, C4,5.3. The influence of different pull strength on nuelcuspulposus pressure:the nuelcuspulposus pressure of all the samples decreased after placed with strength. No significant difference was observed between 150N and 100N pull strength. However, the strength of 200N,300N compared with 100N has significant difference.4. The influence of rotary order to nuelcuspulposus pressure. Statement A has significant increase compared with that in table 4. Statement B has significant increase compared with that in table 3. Statement C does not have significant increase.5. The influence of different statement after pull to nuelcuspulposus pressure. The nuelcuspulposus pressures on three statements have significantly increased compared with that in table 3.6. The influence of pull strength on the nuelcuspulposus pressure. Three statement of strength have significant increase compared with table 3.7. The changes of nuelcuspulposus pressure after the sample was put into origin position. The pressure has significantly decreased compared with table 2.8. The times needed to decrease the nuelcuspulposus pressure after pull. Statement A is significantly higher than the statement B,C. No significant difference was observed between statement B and C.9. The influence of different pull time on the nuelcuspulposus pressure. No significant difference was observed between the three statements.10. The influence of different angles the flexion and extension on the nuelcuspulposus pressure. Compared to the results of neutral position, results with loadding extension and flexion 10°,15°,20°were increased; Comparison of the same angle of flexion and extension under pressure nucleoplasty pulled no difference in values, no statistical significance.[conclusions]1. In stationary state, pressure of human cervical discectomy specimens gradually increased from the top-down, and with the load increasing.2. Pressure of normal human nucleus pulposus of cervical intervertebral disc can be increased, when bear vertical compression force, reverse force and the different position of flexion and extension.And it can be reduced in bearing traction in the vertical stress. The magnitude of the pressure change and the power load was positively correlated within a certain range.3. During the rotation, coupled with adequate traction can reduce pressure inside the nucleus. Practicing Traction and rotation in the same time could have been avoided increase of the pressure, which of the way to load a separate force within the nucleus rotates. Taking a Small angle of flexion or neutral position can enhance the implementation of security practices. |
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