Improving stability of locking compression plates through a design modification: a computational investigation

D. Anitha, Shamal Das De, Khong Kok Sun, Hitendra K. Doshi, Taeyong Lee

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Femoral shaft fractures are common in both the young and elderly due to high-impact trauma and low-impact trauma, respectively. Its treatment by indirect reduction through use of locking compression plates (LCPs) has been on the rise. The LCP possess several advantages in fracture fixation, combining angular stability through use of locking screws with misalignment correction and fracture reduction onto the plate through use of conventional screws. However, there have been cases of plate breakage and fracture non-unions to warrant a study to improve its stability. A design modification is suggested for mid-diaphyseal fractures, whereby unused screw holes are removed. The structural stability of the modified and commercially available LCP is computationally analyzed using finite element modelling and a comparison made in terms of mechanical performance across different fracture lengths. A critical fracture length for which the commercially available LCP is functional as a fixator for mid-diaphyseal fractures was established. The maximum von Mises' stress attained by the commercially available LCP rose to as high as 105 MPa, whereas for the modified LCP, it did not exceed 25 MPa. As expected, these stresses were also found at screw holes, nearest to the fracture site. Critical fracture length allows clinicians to quantitatively distinguish between mid-diaphyseal fractures that can or cannot be treated by the use of LCP fixation. It is also believed that the proposed design modification will substantially increase the fatigue life of the fixator, especially at screw holes nearest to the fracture region, where most fatigue fractures are known to occur and will consequently be functional for greater fracture lengths.

Original languageEnglish
Pages (from-to)153-161
Number of pages9
JournalComputer Methods in Biomechanics and Biomedical Engineering
Volume18
Issue number2
DOIs
StatePublished - 25 Jan 2015

Bibliographical note

Funding Information:
This work was supported by the Academic Research Funding (AcRF #R397-000-094-112) from the Ministry of Education (MoE), Singapore. The authors are appreciative for useful advice and CT scans from Dr. Insu Jeon (Chonnam National University) and Dr Dai-Soon Kwak (The Catholic University of Korea). The authors would also like to thank Ms Saara Afzal for her contributions in the numerical analysis part of this study. All authors have no conflicts of interest.

Publisher Copyright:
© 2013 Taylor & Francis.

Keywords

  • Femur
  • computational model
  • finite element analysis
  • fracture fixation
  • locking compression plate

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