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Digital technique assisted three-dimensional measurement of acetabular orientation for Chinese people

ZHANG Heng-hui1, QU Yang2, CHEN Xiao-jun3, DAI Ke-rong1, WANG Liao1, AI Song-tao2   

  1. 1.Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedics, Shanghai Ninth Peoples Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China; 2.Department of Radiology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011， China; 3.Institute of Biomedical Manufacturing and Life Quality Engineering, State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

  • Online:2016-09-28 Published:2016-10-31
  • Supported by:

    Shanghai Municipal Education Commission—Gaofeng Clinical Medicine Grant, 20152221；National Natural Science Foundation of China, 81201412, 81301260；Shanghai Pujiang Program, 15PJD025

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Abstract:

Objective·To develop a reliable and accurate 3D acetabular orientation measurement method for Chinese people. Methods·CT data of 60 (30 males and 30 females) adult patients with disease irrelevant to bones were collected. 3D models of osseous pelves were generated and the 3D coordinates of osseous pelves were manually selected and optimized via iterations. A surface-based method was used to realize semi-automatic measurement of acetabular spatial parameters and describe acetabular characteristics of Chinese people. A software was developed to verify the accuracy and reliability of this method. Results·3D model based acetabular measurement method was quite reliable (intraclass correlation coefficient [ICC]>0.999) and accurate. Both anteversion (average: 3.1°, 95%CI 2.0°-4.2°, P=0.004) and anatomic inclination (0.9°, 95%CI 0.4°-1.4°, P=0.028) of females were greater than those of males. There was no significant difference in bilateral acetabular orientation. However, bilateral differences in anteversion (maximum 9.1°) and inclination (maximum 5.7°) were observed in some individuals. Conclusion·Differences in acetabular orientation between males and females were statistically significant (P<0.05). The variation ranges of acetabular orientation were wide, especially the anteversion. Individual acetabular orientation was relatively symmetrical. 3D acetabular measurement and analysis are helpful for the diagnosis and treatment of hip disease and the design of prosthesis.

Key words: acetabulum, anteversion, inclination, arthroplasty, computer-assisted , image processing, three-dimensional modelling