Chinese Journal Of Clinical Anatomy ›› 2016, Vol. 34 ›› Issue (2): 151-154.doi: 10.13418/j.issn.1001-165x.2016.02.007

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Research on positioning methods of the ankle joint in three-dimensional model

CHEN Qing1,  LI Xing-rui1,  SHENG Hua-jun1,  LV Fa-jin2   

  1. 1.Department of Anatomy, Chongqing Medical University, Chongqing 400016, China; 2.Department of Radiology, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400042, China
  • Received:2015-05-08 Online:2016-03-25 Published:2016-04-14

Abstract:

Objective To find out the exact center of ankle joint position, this study use different methods in three-dimensional(3D) reconstruction model, and determine the feasibility of these methods. Then provide morphological basis for the 3D simulation of lower limb knee arthroplasty. Methods 33 cases of normal adult ankle joints were scanned by CT. The data was imported into three-dimensional reconstruction software. 3D reconstruction software was used to reconstruct the 3D model of the ankle joint; the midpoint of top talus (point A)、the centroid of point cloud in top talus(point B) and the midpoint between the medial malleolus and lateral malleolus(point C) respectively were used for positioning of the center of the ankle joint in the reverse engineering software, and measurement of the distance among these three points in the coronal plane. Data analysis was performed using statistics package for social science (SPSS). Results The 3D model of the ankle joint was successfully established, and the center of ankle joint  was located using different positioning methods. The measurement results showed: The average distance between point A and point B was (1.058±0.714)mm; The average distance between point B and point C was (1.684±1.283)mm; The average distance between point A and point C was (1.484±1.040)mm. And the distance difference between each group was not statistically significant (P>0.05). Conclusion Location of center of the ankle joint based on 3D reconstruction is feasible, and more stable than positioning methods in two-dimensional plane. And the centroid of point cloud in top talus as the talus center of ankle joint are more convenient than the other two methods.

Key words: Three-dimension reconstruction, Center of ankle joint, Three-dimension positioning, Total knee arthroplasty