Athwal George S, Rouleau Dominique M, MacDermid Joy C, King Graham J W
Hand and Upper Limb Centre, St. Joseph's Health Care, University of Western Ontario, 268 Grosvenor Street, London, ON N6A 4L6, Canada. E-mail address for G.S. Athwal:
University of Montreal, Hôpital Sacré-Coeur, 5400 Boulevard Gouin Ouest, Montreal, QC H4J 1C5, Canada.
JBJS Essent Surg Tech. 2012 Mar 28;2(1):e6. doi: 10.2106/JBJS.ST.K.00029. eCollection 2012 Feb.
This article describes a technique in which measurements are obtained from radiographs of the contralateral, normal elbow to predict the magnitude of overlengthening resulting from use of a metallic radial head prosthesis.
STEP 1 OBTAIN BILATERAL ELBOW RADIOGRAPHS: Obtain bilateral digital anteroposterior radiographs of the elbows that are orthogonal to the forearm in 45° of flexion and neutral forearm rotation.
STEP 2 PERFORM RADIOGRAPHIC MEASUREMENTS OF THE CONTRALATERAL NORMAL ELBOW: Draw the angle on the radiograph of the normal elbow.
STEP 3 PERFORM RADIOGRAPHIC MEASUREMENTS OF THE RADIAL HEAD IMPLANT: Draw the same lines and angle and perform the same measurements on the implant radiograph.
STEP 4 CALCULATE RADIAL HEAD IMPLANT LENGTH: The virtual length of the native radial head implant () is subtracted from the virtual length of the radial head implant (), which results in the magnitude of the radial head implant overlengthening in millimeters: () - () = overlengthening.
The radiographic measurement technique was validated in a cadaveric study.
IndicationsContraindicationsPitfalls & Challenges.
本文介绍了一种技术，即从对侧正常肘部的X线片获取测量值，以预测使用金属桡骨头假体导致的过度延长幅度。
步骤1：获取双侧肘部X线片：获取双侧肘部的数字化前后位X线片，肘部在屈曲45°且前臂中立旋转时与前臂正交。
步骤2：对侧正常肘部的X线测量：在正常肘部的X线片上绘制角度。
步骤3：桡骨头植入物的X线测量：在植入物X线片上绘制相同的线和角度，并进行相同的测量。
步骤4：计算桡骨头植入物长度：将天然桡骨头植入物的虚拟长度（）从前臂桡骨头植入物的虚拟长度（）中减去，得出桡骨头植入物以毫米为单位的过度延长幅度：（） - （） = 过度延长。
该X线测量技术在尸体研究中得到验证。
适应证、禁忌证、陷阱与挑战。
