Investigation of fixation screw pull-out strength on human spine

Zhang, Q.H; Tan, Soon Huat; Chou, Siaw Meng

doi:10.1016/j.jbiomech.2003.09.005

Cited by 76 publications

(71 citation statements)

References 12 publications

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“…It is interesting to emphasize at this point that the number of numerical studies dealing with the investigation of the mechanical behaviour of a bone screw under pure pull-out loads is rather small [19][20][21][22][23][24] compared to the respective number of experimental studies. From these studies the only cases where a FE model was used for the prediction of the pullout force of different bone screws were those by Zhang et.…”

Section: Discussionmentioning

confidence: 99%

“…al. [19,20]. The FE model developed by them simulated the behaviour of a pedicle screw pulled out from a rectangular volume of bone.…”

Section: Discussionmentioning

confidence: 99%

“…Finally, the total number of threads [19] and the purchase length [7] of the screw are reported to be linearly correlated with the screw's pullout force. The same conclusion was also drawn from the present analysis ( Fig.13) and this linear correlation was expressed in the form of an empirical equation.…”

Section: Discussionmentioning

confidence: 99%

“…The boundary conditions imposed on the surfaces between the screw and the SRPF were those of simple contact with friction and the value of the friction coefficient was set according to the literature [19,20] equal to 0.2.…”

Section: Fe Model -Design Calibration Validationmentioning

confidence: 99%

“…Especially for the screw design and its influence on the pullout force many experimental [6][7][8][9][10][11][12][13][14][15][16][17][18] and numerical [19][20][21][22][23][24] studies have been carried out. Additionally some researchers have attempted to quantify the factors that influence the pullout force of a bone screw using equations developed for "machine" screws (i.e.…”

Section: Introductionmentioning

confidence: 99%

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A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

Chatzistergos

Magnissalis

Kourkoulis

2010

Medical Engineering & Physics

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Abstract:The present study aims to the design of a finite-element model simulating accurately the pullout behaviour of cylindrical pedicle screws and predicting their pullout force. Three commercial pedicle screws, subjected to pure pullout from synthetic bone, were studied experimentally. The results were used for the design, calibration and validation of a finite-element model. Special attention was paid to the accurate simulation of the failure inside the host material. For this purpose a bilinear cohesive zone material model was adopted to control mode-II debonding of neighbouring elements in the vicinity of the screw and simulate this way the failure in shear of the hosting material. Comparison between experimental and numerical results proved that the implementation of this method can significantly enhance the accuracy of the numerical simulation of a screw's mechanical behaviour under pure pullout loads. The numerical model was used for the parametric study of various factors affecting the pullout performance of a cylindrical pedicle screw. It was concluded that the major parameters influencing the pullout force is the outer radius and purchase length of the screw. Significantly weaker was the dependence of the screw's pullout force on its thread inclination, depth and pitch.

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Section: Discussionmentioning

confidence: 99%

“…al. [19,20]. The FE model developed by them simulated the behaviour of a pedicle screw pulled out from a rectangular volume of bone.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Fe Model -Design Calibration Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

Chatzistergos

Magnissalis

Kourkoulis

2010

Medical Engineering & Physics

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Laser resonance frequency analysis of pedicle screw stability: A cadaveric model bone study

Nakashima

Mikami

Kikuchi

et al. 2021

Journal Orthopaedic Research

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There is no evaluation method currently available to assess intraoperative pedicle screw fixation (PSF) strength. In this study, we established a laser-based resonance frequency analysis (RFA) system with high-speed, noncontact, quantitative measurements of PSF. Clinical investigations in the future can assess surgical failure risk of implants. We investigated the characteristics of the laser RFA and compared them with the conventional methods. We inserted a pedicle screw in the vertebral pedicle of human cadaver or model bone, followed by screw pull-out, peak torque, implant stability quotient (ISQ) value obtained by the magnetic dental RFA system, and fixation force of laser RFA. We compared the outcomes using best-fit linear or logarithmic approximations. For the model bone study, the resonance frequency (RF) versus peak torque/pull-out force (POF) demonstrated strong correlations using logarithmic approximation (vs. peak torque: R = 0.931, p < .001, vs. POF: R = 0.931, p < .001). RF strongly correlated with the ISQ value using linear approximation (R = 0.981, p < .001). For the cadaveric vertebrae study, the correlation coefficients between RF and the peak torque/POF were significant regardless of approximation method (peak torque: logarithmic: R = 0.716 vs. linear: R = 0.811; p < .001) (POF: logarithmic: R = 0.644 vs. linear: R = 0.548; p < .05). Thus, the results of this study revealed a constant correlation between RFA and conventional methods as a measurement validation, predicting favorable support for intraoperative PSF. RFA has the potential to be a new index for evaluating the implant fixation force.

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Evaluation of the efficacy of modal analysis in predicting the pullout strength of fixation bone screws

2022

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Background: Pilot hole preparation has been shown to have an impact on the short and long-term stability of the screw fixation constructs.Purpose: Investigation and comparison of two nondestructive modal analysis methods with conventional insertion torque (IT) and pullout tests in optimum pilot hole diameter detection.Methods: Twenty conical core titanium screws were embedded in high-density polyethylene blocks with different pilot hole diameters. The maximum IT was recorded for each screw during implantation. Then, two modal analysis methods including accelerometer (classical modal analysis [CMA]) and acoustic modal analysis (AMA) were carried out to measure the natural frequency (NF) of the bone-screw structure. Finally, stiffness (S), pullout force (F ult ), displacement at F ult (d ult ) and energy dissipation (ED) were obtained from the destructive pullout test. Results:The IT increased, as the pilot hole diameter decreased. The maximum value of IT was observed in the smallest pilot hole diameter. The same trend was found for the F ult and the first NF derived from both modal methods except for 5.5 mm pilot hole diameter. The natural NFs derived from CMA and AMA showed high correlations in different groups (R 2 = 0.94) and did not deviate from y = x hypothesis in linear regression analysis. The F ult , d ult , and ED were measured 4800 ± 172 N, 3.10 ± 0.08 mm and 14.23 ± 1.10 N.mm, respectively. Discussion: No significant change was observed in "S" between the groups. The highest F ult and first NF were obtained for the 5.5 mm pilot hole diameter. Both CMA and AMA were found to be reliable methods and can promote the undesirable contradiction between F ult and IT.

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Investigation of fixation screw pull-out strength on human spine

Cited by 76 publications

References 12 publications

A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

Laser resonance frequency analysis of pedicle screw stability: A cadaveric model bone study

Evaluation of the efficacy of modal analysis in predicting the pullout strength of fixation bone screws

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