Pressure Measurement in the Cervical Spinal Facet Joint
Pressure Measurement in the Cervical Spinal Facet Joint
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DOI：
10.1097/brs.0b013e3181ee7de2
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发表时间：
2011-07-01
期刊：
影响因子：
3
通讯作者：
Winkelstein, Beth A.
中科院分区：
文献类型：
--
作者：
Jaumard, Nicolas V.;Bauman, Joel A.;Winkelstein, Beth A.
研究设计。研究了一种新的无创方法来测量颈椎小关节压力，该方法使用可通过骨侧块的孔插入的尖端传感器。该技术的优势在于它不需要切除关节囊，但在其适用性方面存在潜在的问题。目的是评估尖端压力探针的位置和方向对生物力学实验中接触压力测量的影响。背景资料摘要。通过压敏薄膜测量了尸体棘突关节的直接接触压力。然而，这种方法需要切除关节突囊，这会改变整个关节的力学行为，并影响测量的接触压力。在伴侣替身和尸体调查中评估了位置和方向对探针测量的影响。探针被放置在解剖椎体C4/5替代物的关节突上，进行矢状面弯曲。在伸展过程中，使用压敏纸绘制代孕体关节与尸体颈椎节段（n = 3）的接触区域。探针还在尸体表面进行了单轴压缩，以评估相对于接触面的取向对探针信号的影响。虽然实验和理论压力曲线遵循相同的趋势，但测量的最大压力是理论压力的一半。在取向研究中，探针取向为0度和5度时，最大压力没有差异，但取向大于15度时，没有记录到信号。选择这种测量压力的方法是为了在临床相关应用中提供一种微创方法来量化小关节压力。探针的位置和方向都是监测该活动滑膜关节局部压力剖面的关键因素。
Study Design. A novel noninvasive approach to measure facet joint pressure in the cervical spine was investigated using a tip-mounted transducer that can be inserted through a hole in the bony lateral mass. This technique is advantageous because it does not require resection of the joint capsule, but there are potential issues regarding its applicability that are addressed.Objective. The objective was to evaluate the effect of a tip-mounted pressure probe's position and orientation on contact pressure measurements in biomechanical experiments.Summary of Background Data. Measurements of direct contact pressure in the facet joint of cadaveric spines have been obtained via pressure-sensitive films. However, that method requires the resection of the facet capsule, which can alter the overall joint's mechanical behavior and can affect the measured contact pressures.Methods. Influence of position and orientation on probe measurements was evaluated in companion surrogate and cadaveric investigations. The probe was placed in the facet of an anatomic vertebral C4/5 surrogate undergoing sagittal bending moments. Pressure-sensitive paper was used to map contact regions in the joint of the surrogate and cadaveric cervical segments (n = 3) during extension. The probe also underwent uniaxial compression in cadaveric facets to evaluate the effect of orientation relative to the contact surface on the probe signal.Results. Although experimental and theoretical pressure profiles followed the same trends, measured maximum pressures were half of the theoretical ones. In the orientation study, maximum pressures were not different for probe orientations of 0 degrees and 5 degrees, but no signal was recorded at orientations greater than 15 degrees.Conclusion. This approach to measure pressure was selected to provide a minimally-invasive method to quantify facet joint pressures during clinically relevant applications. Both the position and orientation of the probe are critical factors in monitoring local pressure profiles in this mobile synovial joint.