目的　探讨股骨小转子相关解剖数字化测量方法，为设计针对小转子骨折特点的股骨近端内固定系统提供解剖学依据。  方法　对80例完整成人股骨标本行CT扫描，应用Mimics 10.01软件，利用数字化三维重建技术重建股骨，标定相关解剖标志，测量指标包括股骨小转子相关解剖参数。  结果　小转子纵径为(27.01±1.72)mm，横径为(17.82±1.22)mm，应用后倾角为（22.42±9.08）°，应用上倾角为（17.02±2.02）°，拟固定小转子最短螺钉长度为(49.25±3.20) mm，小转子高为(8.59±1.44) mm，小转子体积为(755.91±150.14) mm3。所有测量参数，左、右侧均无统计学差异，P> 0.05。  结论　基于CT影像的股骨数字化三维重建图像具有良好的形态和清晰的边界，可精确识别股骨相应的解剖标志并进行三维测量，能较好地为设计用于小转子骨折固定的股骨近端内固定系统提供解剖学依据。

Objective　To explore digital measurement of the lesser trochanter anatomy on three-dimensional reconstruction of CT images of the femur so that reasonable parameters can be provided for design of Proximal femoral fixation system.    Method    CT scanning of Intact adult femur was conducted (left 40, right 40), the three-dimensional reconstruction of the femur was performed using Mimics10.01 software on the basis of the CT data. The bony landmarks determining relevant anatomy were made on the three-dimensional images of the normal femur. Measurement included the anatomic indexes of the lesser trochanter.    Results　Length of the vertical axis of the lesser trochanter was (27.01±1.72)mm and its the transverse diameter was(17.82±1.22)mm. The angle of retroversion and the up-dip angle was （22.42±9.08）°and （17.02±2.02）°, respectively. The minimum length of the screw which was used to fix the lesser trochanter of femur was (49.25±3.20) mm, The Height and the volume of the lesser trochanter was (8.59±1.44) mm and (755.91±150.14) mm3, respectively. There was no statistically significant difference of the abovementioned parameters in two sides.　Conclusion　It is feasible to accurately identify the anatomy landmarks on the three-dimensional reconstruction of the femur. Digital measurement of the lesser trochanter anatomy can provide reasonable parameters for design of the proximal femoral fixation system.