Purpose: This study aimed to correlate micromotion and gap measurements at the implant-abutment interface.
Materials And Methods: A total of 10 implant-abutment assemblies were subjected to micromotion measurements under cyclic loading and subsequently quartered and inspected under a light microscope to measure vertical and horizontal gaps between implant and abutment. Statistical analysis was based on Pearson product-moment correlations (α = .05).
Results: Micromotion varied from 8.03 μm to 100.32 μm, while horizontal gaps ranged from 8.72 μm to 59.93 μm and vertical gaps ranged from 3.93 μm to 30.82 μm. No significant correlations were found (P > .05).
Conclusion: Simplistic gap measurements at the implant-abutment interface are inadequate for predicting micromotion.
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http://dx.doi.org/10.11607/ijp.5086 | DOI Listing |
Bone Joint Res
January 2025
Department of Mechanical Engineering & Mechanics, Lehigh University, Bethlehem, Pennsylvania, USA.
Aims: The "2 to 10% strain rule" for fracture healing has been widely interpreted to mean that interfragmentary strain greater than 10% predisposes a fracture to nonunion. This interpretation focuses on the gap-closing strain (axial micromotion divided by gap size), ignoring the region around the gap where osteogenesis typically initiates. The aim of this study was to measure gap-closing and 3D interfragmentary strains in plated ovine osteotomies and associate local strain conditions with callus mineralization.
View Article and Find Full Text PDFJ Orthop Surg Res
December 2024
Arthroscopy and Joint Research Institute, Yonsei University College of Medicine, Seoul, Republic of Korea.
Background: No clear agreement exists on the degree of bone formation required to remove a metal plate without correction loss after medial opening-wedge high tibial osteotomy (MOWHTO). We aimed to investigate the mechanical stability of the proximal tibia with different bone formations after plate removal in MOWHTO using finite element models and determine the extent of bone formation when the plate can be removed without correction loss.
Methods: The MOWHTO models with 5, 10, and 15 mm opening gaps were generated.
Bone Joint Res
October 2024
Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China.
Aims: This study aimed to investigate the optimal sagittal positioning of the uncemented femoral component in total knee arthroplasty to minimize the risk of aseptic loosening and periprosthetic fracture.
Methods: Ten different sagittal placements of the femoral component, ranging from -5 mm (causing anterior notch) to +4 mm (causing anterior gap), were analyzed using finite element analysis. Both gait and squat loading conditions were simulated, and Von Mises stress and interface micromotion were evaluated to assess fracture and loosening risk.
Ann Biomed Eng
August 2024
Department of Industrial Engineering, Alma Mater Studiorum - University of Bologna, Bologna, Italy.
The risk of aseptic loosening in cementless hip stems can be reduced by improving osseointegration with osteoinductive coatings favoring long-term implant stability. Osseointegration is usually evaluated in vivo studies, which, however, do not reproduce the mechanically driven adaptation process. This study aims to develop an in silico model to predict implant osseointegration and the effect of induced micromotion on long-term stability, including a calibration of the material osteoinductivity with conventional in vivo studies.
View Article and Find Full Text PDFJ Orthop Res
December 2024
Department of Orthopedic Surgery, Institute for Human Performance, SUNY Upstate Medical University, Syracuse, New York, USA.
Progressive osteolysis can occur at the cement-bone interface of joint replacements and the associated loss of fixation can lead to clinical loosening. We previously developed a rat hemiarthroplasty model that exhibited progressive loss of fixation with the development of cement-bone gaps under the tibial tray that mimicked patterns found in human arthroplasty retrievals. Here we explored the ability of a bisphosphonate (zoledronic acid, ZA) to attenuate cement-bone osteolysis and maintain implant stability.
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