Chinese Journal Of Clinical Anatomy ›› 2019, Vol. 37 ›› Issue (1): 87-90.doi: 10.13418/j.issn.1001-165x.2019.01.018

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Biomechanical study on the changes of pressure and displacement in the different tibiofibular syndesmosis injury model

XU Si-liang1, LU Wei2, HUANG Gang1, XIE Wei-yong1, HE Yue1, XU Jian2   

  1. 1. Longgang Orthopaedics Hospital of Shenzhen, Shenzhen, 518116; 2. Department of Sports Medicine, The 2nd People’s Hospital of Shenzhen, Shenzhen 518035, Guangdong Province, China
  • Received:2018-01-10 Online:2019-01-25 Published:2019-02-20

Abstract:

Objective To explore the relationship between the reduction pressure and displacement after the tibiofibular syndesmosis injury and find out the best  reduction force. Methods Ten fresh frozen-thawed calf specimens were selected. The tibiofibular syndesmosis was exposed. then the anterior structures (anterior tibiofibular ligament), posterior structures including the posterior tibiofibular ligament, the transverse tibiofibular ligament, and the interosseous membrane 10 cm proximally were dissected respectively. Each model underwent CT scans, and the distances from the point A on the lateral malleolus ridge to the point B on the center of the medial tibia were then measured. Meanwhile, the reduction was performed and the relationship between distance and pressure was recorded.   Results    The Mimics software was used to measure the distance of AB in different models. After  disruption of the anterior tibiofibular syndesmosis, anteroposterior tibiofibular syndesmoses, anteroposterior tibiofibular syndesmoses combined with the interosseous membrane 10 cm proximally, the average distance of AB increased significantly compared with that with the intact tibiofibular syndesmosis (P<0.05), but the corresponding distances between each model were not statistically significant (P>0.05). Using the biomechanical stress tester, the magnitude of stress was detected to be 40~70 N. There was no significant difference in the magnitude of the restoring force between anterior tibiofibular syndesmosis and anteroposterior tibiofibular syndesmoses injury models (P>0.05). There was no significant difference in the magnitude of the restoring force between anteroposterior tibiofibular syndesmoses and anteroposterior tibiofibular syndesmoses combined with the interosseous membrane 10 cm proximally injury models (P>0.05), but there was a significant difference in the magnitude of the restoring force between anterior tibiofibular syndesmosis and anteroposterior tibiofibular syndesmoses combined with the interosseous membrane 10 cm proximally injury models (P<0.05). Conclusions In different degree of tibiofibular syndesmosis injuries, there is a significant difference in the deviation distance of the tibiofibular syndesmosis, and different forces must be chosen to reduce the different stages of tibiofibular syndesmosis displacement.

Key words: Distal sydesmosis, Reduction, Compression force, Displacement