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首页> 外文期刊>Biomedical Engineering: Applications, Basis and Communications >EFFECTS OF PELVIC AND FEMORAL POSITIONING ON CANINE NORBERG ANGLE MEASUREMENTS AND TEST-RETEST RELIABILITY: A COMPUTED TOMOGRAPHY-BASED SIMULATION STUDY
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EFFECTS OF PELVIC AND FEMORAL POSITIONING ON CANINE NORBERG ANGLE MEASUREMENTS AND TEST-RETEST RELIABILITY: A COMPUTED TOMOGRAPHY-BASED SIMULATION STUDY

机译：骨盆和股骨定位对犬Norberg角度测量和测验可靠性的影响：基于计算机断层扫描的模拟研究

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摘要

Canine hip dysplasia is a common disease in dogs, often diagnosed by using the Norberg angle (NA), an index for the laxity of the hip joint. Measurement of the NA can be affected by the pelvic and femoral positioning during imaging, the effects and test-retest reliability of which have not been documented. To bridge the gap in knowledge, computed tomography data from 11 Labrador Retriever dogs were obtained and used to generate synthetic ventrodorsal radiographs of the hip for NA measurements via a perspective projection model. Twenty-five synthetic radiographs of the hips were generated at positions defined by combinations of five pelvic tilt angles (-20° to 20° at 10° intervals) and five femoral elevation angles (from full extension to 40° at 10° intervals). For each radiograph, the NA was measured three times by each of the two experienced veterinarian examiners. It was found that both the increase in caudal pelvic tilt and femoral elevation increased the measured NA, although the intra- and inter-examiner reliability was very good for a given hip position. The current results suggest that careful positioning of the pelvis and femur during radiographic imaging is critical for accurately measuring the NA, and thus the laxity of the hip, for the clinical diagnosis of hip dysplasia.
机译：犬髋关节发育不良是犬的常见疾病，通常使用Norberg角（NA）（髋关节松弛的指标）进行诊断。 NA的测量可能会受到成像期间骨盆和股骨定位的影响，其影响和重新测试的可靠性尚未得到证明。为了弥合知识差距，从11只拉布拉多猎犬的狗获得了X线断层扫描数据，并通过透视投影模型将其用于髋关节的合成腹侧X光片，以进行NA测量。在由五个骨盆倾斜角（以10°的间隔从-20°到20°）和五个股骨仰角（以10°的间隔从完全伸展到40°）的组合所定义的位置上，产生了二十五个臀部的合成X线照片。对于每张射线照片，两名经验丰富的兽医检查员均对NA进行了三次测量。已发现，尽管对于给定的髋部位置，检查者内部和检查者之间的可靠性非常好，但尾骨盆倾斜度的增加和股骨抬高都增加了所测量的NA。目前的结果表明，在放射线照相成像过程中仔细定位骨盆和股骨对于准确测量NA并因此测量髋关节的松弛对于临床诊断髋关节发育不良至关重要。

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