Abstract
Purpose
During total hip replacement (THR), prosthesis material is stiffer than the bone tissue, decreasing load transmission to the host tissue around the prosthesis. After a THR, the aim is to achieve stress distribution along the femur close to normal physiological stress distribution for all loads transferred across the hip joint. In this study, we analyzed the advantages of using a collared stem over collarless one with the finite element method (FEM), strain gauges (SGs), and the digital image correlation (DIC) system.
Methods
In the biomechanical tests, we implanted composite femurs and loaded them with the stance configuration in a universal testing machine (Instron). We compared the predicted strains with the strains recorded experimentally in the same regions of the femur.
Results
The results revealed that for collarless stems, a high level of stress concentration is observed in the distal region of the implant but not in the proximal region. The collared case presents a strain distribution closer to that of a healthy bone proximal zone that was almost two times better than in case of the collarless stem, whereas stresses in the distal part of the femur corresponded to a healthy state. Finally, the numerical results for the bone adaptation around the implant provided clear evidence that the collar design strongly influences the proximal resorption because of better load transmission.
Conclusions
According to both the numerical and experimental results, a collar that connects to the bone cut may decrease the proximal stress shielding effect and distal cortical hypertrophy.
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Acknowledgements
The work has been supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES) – Finance Code 001; and K.C. Wang Magna Fund in Ningbo University (2019).
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Levadnyi, I., Gubaua, J.E., Dicati, G.W.O. et al. Comparative Analysis of the Biomechanical Behavior of Collar and Collarless Stems: Experimental Testing and Finite Element Modelling. J. Med. Biol. Eng. 41, 844–855 (2021). https://doi.org/10.1007/s40846-021-00652-w
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DOI: https://doi.org/10.1007/s40846-021-00652-w