Normal anatomical variants and pathological deformities of the pediatric hip can only be differentiated after a prior definition of normal ranges for anthropometric parameters with increasing age. Aim of the present study was to provide reliable reference values of the pediatric hip morphometry, using computed tomography (CT)-based rotation-corrected summation images of the pelvis that simulate the widely available plain radiograph-based measurements, but offer the higher precision of the CT technique. This retrospective study included 85 patients (170 hips) under 15 years of age (0–15). The measured anthropometric parameters included femur head extrusion index, lateral center-edge angle, acetabular inclination, Tönnis angle, and femoral neck-shaft angle. Mean values, range, SD, P values, intra-rater, and inter-rater reliability were calculated. All measurements correlated with age. None of the measurements correlated with gender or side. Rapid growth phases were noted in all measurements at the age of 12 (14 in males and 11 in females). The inter-rater and intra-rater reliability was high (range inter/intraclass correlation coefficient 0.926–0.998 Cronbach’s alpha 0.986–0.998). The present work provides age- and gender-related normative values of the classically used hip measurements as well as growth phases describing pediatric hip morphology in a broad age range. A discrepancy was noted between the values measured in the current study and the classical X-ray-based reference values in the literature especially for the Tönnis angle and LCEA values. This suggests that the rotation and inclination correction in the CT-based techniques might have the advantage of compensating for a possible overestimation in the conventional X-ray-based methods.

小儿髋关节的正常解剖变异和病理畸形只有在事先定义了随年龄增长的人体测量参数的正常范围后才能区分。本研究的目的是提供儿科髋关节形态测量的可靠参考值，使用基于计算机断层扫描 (CT) 的骨盆旋转校正总和图像模拟广泛可用的基于 X 线平片的测量，但提供更高的精度CT技术。这项回顾性研究包括 85 名 15 岁以下 (0-15) 的患者 (170 髋)。测量的人体测量参数包括股骨头挤压指数、外侧中心边缘角、髋臼倾角、Tönnis 角和股骨颈轴角。平均值、范围、SD、P计算值、评估者内和评估者间信度。所有测量值都与年龄相关。没有一项测量与性别或侧面相关。在 12 岁时（男性 14 岁，女性 11 岁）的所有测量中都注意到快速生长阶段。评分者间和评分者内的可靠性很高（范围内/组内相关系数 0.926-0.998 Cronbach's alpha 0.986-0.998）。目前的工作提供了经典使用的髋关节测量的年龄和性别相关的规范值，以及描述广泛年龄范围内小儿髋关节形态的生长阶段。注意到当前研究中测量的值与文献中基于 X 射线的经典参考值之间存在差异，尤其是 Tönnis 角和 LCEA 值。