Biomechanical assessment and 3D finite element analysis of the treatment of tibial fractures using minimally invasive percutaneous plates

Hu,Xin‑Jia; Wang,Hua

doi:10.3892/etm.2017.4629

Biomechanical assessment and 3D finite element analysis of the treatment of tibial fractures using minimally invasive percutaneous plates

Authors:
- Xin‑Jia Hu
- Hua Wang
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Affiliations: Department of Bone and Joint Surgery, Shenzhen People's Hospital, 2nd Clinical Medical College of Jinan University, Shenzen, Guangdong 518020, P.R. China
Published online on: June 20, 2017 https://doi.org/10.3892/etm.2017.4629
Pages: 1692-1698

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Abstract

The aim of the present study was to investigate the biomechanical effects of varying the length of a limited contact‑dynamic compression plate (LC‑DCP) and the number and position of screws on middle tibial fractures, and to provide biomechanical evidence regarding minimally invasive plate osteosynthesis (MIPO). For biomechanical testing, 60 tibias from cadavers (age at mortality, 20‑40 years) were used to create middle and diagonal fracture models without defects. Tibias were randomly grouped and analyzed by biomechanic and three‑dimensional (3D) finite element analysis. The differences among LC‑DCPs of different lengths (6‑, 10‑ and 14‑hole) with 6 screws, 14‑hole LC‑DCPs with different numbers of screws (6, 10 and 14), and 14‑hole LC‑DCPs with 6 screws at different positions with regard to mechanical characteristics, including compressing, torsion and bending, were examined. The 6‑hole LC‑DCP had greater vertical compression strain compared with the 10‑ and 14‑hole LC‑DCPs (P<0.01), and the 14‑hole LC‑DCP had greater lateral strain than the 6‑ and 10‑hole LC‑DCPs (P<0.01). Furthermore, significant differences in torque were observed among the LC‑DPs of different lengths (P<0.01). For 14‑hole LC‑DCPs with different numbers of screws, no significant differences in vertical strain, lateral strain or torque were detected (P>0.05). However, plates with 14 screws had greater vertical strain compared with those fixed with 6 or 10 screws (P<0.01). For 4‑hole LC‑DCPs with screws at different positions, vertical compression strain values were lowest for plates with screws at positions 1, 4, 7, 8, 11 and 14 (P<0.01). The lateral strain values and vertical strain values for plates with screws at positions 1, 3, 6, 9, 12 and 14 were significantly lower compared with those at the other positions (P<0.01), and torque values were also low. Thus, the 14‑hole LC‑DCP was the most stable against vertical compression, torsion and bending, and the 6‑hole LC‑DCP was the least stable. However, the use of 14 screws with a 14‑hole LC‑DCP provided less stability against bending than did 6 or 10 screws. Furthermore, fixation with distributed screws, in which some screws were close to the fracture line, provided good stability against compression and torsion, while fixation with screws at the ends of the LC‑DCP provided poor stability against bending, compressing and torsion.

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