Finding the right fit: studying the biomechanics of under-tapping with varying thread depths and pitches

Jazini, Ehsan; Petraglia, Carmen; Moldavsky, Mark; Tannous, Oliver; Weir, Tristan B.; Saifi, Comron; Elkassabany, Omar; Cai, Yiwei; Bucklen, Brandon; O’Brien, Joseph R.; Ludwig, Steven C.

doi:10.1016/j.spinee.2016.11.019

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The Spine Journal

2017

DOI: 10.1016/j.spinee.2016.11.019

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Finding the right fit: studying the biomechanics of under-tapping with varying thread depths and pitches

Ehsan Jazini

Carmen Petraglia

Mark Moldavsky

et al.

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Cited by 7 publications

(1 citation statement)

References 21 publications

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“…At present, axial pullout test is the standard method to test the fixation strength and stability of medical bone screws in biomechanical experiments on cadaveric and animal bone and in synthetic bone surrogates . This test assumes microfracture or bone resorption, caused by high axial pullout stress, to be the main reason for screw loosening.…”

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confidence: 99%

Bone resorption triggered by high radial stress: The mechanism of screw loosening in plate fixation of long bone fractures

Feng

Lin

Fang

et al. 2019

Journal Orthopaedic Research

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Screw loosening is a common complication in plate fixation. However, the underlying mechanism is unclear. This study investigated screw loosening mechanisms by finite element analysis (FEA) simulation and clinical X‐ray feature analysis. Two FEA models incorporated bone heterogeneity and orthotropy, representing fracture fixation using dynamic compression plate (DCP) and locking compression plate (LCP), were developed. These models were used to examine the volume of bone exceeding a certain stress value around each screw under physiologically‐relevant loading conditions. These damaged bone was then separated and compared by the axial stress and radial stress of each screw. In addition, features of patients’ X‐ray images showing screw loosening were analyzed to validate the loosening features simulated by the models. The FEA study showed that more damaged bone was found at the central two screws which gradually decreased toward the two end screws in all groups. More bone was damaged by the radial stress of each screw than by the axial stress. The radiological analysis of screw loosening showed that bone loss occurred at the screw closest to the fracture line first then subsequent bone loss at the screws further away from the fracture line occurred. This study found that the two screws nearest to the fracture line are more vulnerable to loosening. The radial stress of the screw plays a larger role in screw loosening than the axial stress. Bone resorption triggered by the high radial stress of screws is indicated as the mechanism of screw loosening in the diaphyseal plate fixation. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1498–1507, 2019.

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confidence: 99%

Bone resorption triggered by high radial stress: The mechanism of screw loosening in plate fixation of long bone fractures

Feng

Lin

Fang

et al. 2019

Journal Orthopaedic Research

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Failure mechanisms of pedicle screws and cortical screws fixation under large displacement: A biomechanical and microstructural study based on a clinical case scenario

Zhang

Ren

Feng

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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Recommendations for standardised screw pull-out from polyurethane foam - The influence of density variations of the test foam and the insertion method

Weidling

Wendler

Schoenfelder

et al. 2022

Medical Engineering & Physics

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Finding the right fit: studying the biomechanics of under-tapping with varying thread depths and pitches

Cited by 7 publications

References 21 publications

Bone resorption triggered by high radial stress: The mechanism of screw loosening in plate fixation of long bone fractures

Bone resorption triggered by high radial stress: The mechanism of screw loosening in plate fixation of long bone fractures

Failure mechanisms of pedicle screws and cortical screws fixation under large displacement: A biomechanical and microstructural study based on a clinical case scenario

Recommendations for standardised screw pull-out from polyurethane foam - The influence of density variations of the test foam and the insertion method

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