Summary
This study aims to explore the biomechanical performance of implant-retained finger
prostheses of different lengths and diameters designed specifically for Asians under
external loads from different directions by the finite element method. According to
the metacarpophalangeal stumps (length: 4, 7, 10 mm, diameter: 3.5, 4.5 mm) retained
in Asian patients with finger defects, six implant-retained finger prosthesis models
of different lengths and diameters were designed in Solid Works 3D, transported to
Abaqus, and constructed based on computerized tomography (CT). The finite element
simulation of the finger prosthesis structure was performed using HyperMesh. The strain
and stress distribution of the finger prosthesis models under three loads were calculated:
axial force, lateral force, and lateral force with bending moments. As the load increased,
the cancellous bone yielded first, while the dense bone and implant could withstand
much higher loads than the cancellous bone. As the implant depth increased, the maximum
strain of the cancellous bone increased significantly, but the effect of the implant
diameter remained unclear. In addition, the structure could withstand large axial
loads but was much less able to withstand both lateral forces and bending moments.
The yielding and destruction of the implant-retained finger prostheses designed specifically
for Asians are mainly attributed to cancellous bone. As the depth of the implants
increases, the maximum strain of cancellous bone rises significantly. In addition,
in the treatment of patients with finger defects, this method may be used to analyze
and select which implant can withstand stronger stress according to the finger stumps
of the patients with finger defects so that the most suitable implant and individual
surgical plan for the patient can be designed.
Keywords
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Article info
Publication history
Published online: August 20, 2022
Accepted:
August 16,
2022
Received:
October 27,
2021
Identification
Copyright
© 2022 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.
