Khiami Frédéric, Aziria Sid-Ali, Ragot Stéphanie, Pascal-Moussellard Hugues, Richer Jean-Pierre, Scepi Michel, Brèque Cyril, Hirsch Caroline
Department of Orthopaedic and Sport Traumatology Surgery, AP-HP, Hôpital Pitié-Salpêtrière, 47-83 Boulevard de l'Hôpital, 75013, Paris, France,
Surg Radiol Anat. 2015 Jan;37(1):93-9. doi: 10.1007/s00276-014-1324-4. Epub 2014 Jun 21.
Measuring foraminal stenosis is generally determined by an area calculation. It is difficult to know exactly where it is most appropriate to measure. No precise data are available on a method for calculating the foraminal volume using a CT. To develop a new method for measuring lumbar foraminal volume, we analyzed repeatability and reliability for measuring methods for foraminal volume using CT.
The measurements were performed using a CT scan from ten healthy patients, with a mean age of 26.3 years. L3-L4, L4-L5 and L5-S1 foramen were studied, to obtain 60 foraminal measurements. Inter- and intra-observer reproducibility was calculated. Each series was analyzed using the VitreaCore® reconstruction software for volume calculation.
Average volume measurements of 60 foramina and 20 L4-L5 foramina were, respectively, 1.17 and 1.25 mm(3) for observer 1 and 1.21 and 1.29 for observer 2. The intra-observer correlation coefficients for observer 1 when measuring all foramina and L4-L5 foramina were 0.98 and 0.99, respectively. For observer 2, coefficients were 0.90 and 0.92, respectively. The inter-observer correlation coefficients for observer 1 when measuring all foramina and L4-L5 foramina were 0.78 and 0.83, respectively. For observer 2, coefficients were 0.77 and 0.8, respectively. The average differences in intra- and inter-observer measurements regardless of the evaluator group were less than 0.2 mm(3).
This is the first study measuring lumbar foraminal volume using CT. The excellent reproducibility of this simple measure can supplement a range of foramen measurement tools.
测量椎间孔狭窄通常通过面积计算来确定。很难确切知道最合适的测量位置。目前尚无关于使用CT计算椎间孔容积方法的精确数据。为开发一种测量腰椎椎间孔容积的新方法，我们分析了使用CT测量椎间孔容积方法的重复性和可靠性。
对10名平均年龄为26.3岁的健康患者进行CT扫描测量。研究了L3-L4、L4-L5和L5-S1椎间孔，共获得60次椎间孔测量数据。计算了观察者间和观察者内的可重复性。每个系列均使用VitreaCore®重建软件进行容积计算分析。
观察者1测量的60个椎间孔和20个L4-L5椎间孔的平均容积分别为1.17和1.25立方毫米，观察者2分别为1.21和1.29立方毫米。观察者1测量所有椎间孔和L4-L5椎间孔时的观察者内相关系数分别为0.98和0.99。观察者2的系数分别为0.90和0.92。观察者1测量所有椎间孔和L4-L5椎间孔时的观察者间相关系数分别为0.78和0.83。观察者2的系数分别为0.77和0.8。无论评估者组如何，观察者内和观察者间测量的平均差异均小于0.2立方毫米。
这是第一项使用CT测量腰椎椎间孔容积的研究。这种简单测量方法的出色可重复性可补充一系列椎间孔测量工具。
