New Biomechanical Approach for Evaluation of Spinal Pedicle Screw Fixation Stability

Einafshar, Mohammadjavad; Hashemi, Ata

doi:10.1007/s40846-021-00628-w

Cited by 10 publications

(9 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The recorded sound was transferred to MATLAB R2017 (Natick, Mathworks Inc. USA) software and data converted from time domain into the frequency domain using fast Fourier transform. The location of the peaks illustrated the natural frequencies at different modes 38,39 . The first peak in the frequency response is known as the first mode of vibration 44 .…”

Section: Methodsmentioning

confidence: 99%

“…Classical modal analysis (CMA) was performed for each sample very similar to the previous studies. 38 , 39 A unidirectional accelerometer (code of 4374, Bruel & Kjaer Inc., Denmark) with 0.27 g mass was attached to the flattened head of the screw using a thin double‐sided tape (Figure 2B ). The recording device was calibrated using multiple impacts to avoid overloads.…”

Section: Methodsmentioning

confidence: 99%

“…5 The nondestructive modal analysis technique has been used to determine the initial stability of spinal pedicle screws by extracting the fundamental natural frequency (NF) from recorded acceleration-time response. 38,39 To further investigate the applicability of the newly introduced modal analysis method, the present study was aimed to evaluate the effect of different pilot hole diameters on the primary stability of pedicle screws in the high-density polyethylene (HDPE). The primary stability was measured with four different methods in order to verify the accuracy and reliability of the methods.…”

Section: Introductionmentioning

confidence: 99%

“…This method has yielded a new approach to evaluate both primary and secondary stability of dental implants 5 . The nondestructive modal analysis technique has been used to determine the initial stability of spinal pedicle screws by extracting the fundamental natural frequency (NF) from recorded acceleration‐time response 38,39 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

2022

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

2022

Self Cite

View full text Add to dashboard Cite

show abstract

Nondestructive acoustic modal analysis for assessing bone screw stability: An ex vivo animal study

Einafshar,

Najafidoust,

Bastami

et al. 2024

Journal Orthopaedic Research

View full text Add to dashboard Cite

Conventional insertion torque and pull‐out tests are destructive and unsuitable for clinical bone screw fixation. This study evaluates screw stability using acoustic modal analysis (AMA) and Periotest compared to traditional methods in an ex vivo animal model. Titanium self‐tapping screws (STS) and nonself‐tapping screws (N‐STS) were implanted in the proximal tibia of 12 rabbits. Four testing methods were used to assess screw stability: peak insertion torque (PIT) during implantation, AMA for natural frequency (NF), Periotest for Periotest value (PTV), and pull‐out test for peak pullout force (PPF). Euthanization was performed at 0 (primary stability), 4, and 8 weeks (secondary stability). No significant difference in primary stability was found between STS and N‐STS except for AMA (STS: NF 2434 ± 67 Hz, N‐STS: NF 2572 ± 43 Hz; p = 0.62). Secondary stability increased significantly over time for both screw types (4‐week: NF 3687 ± 36 vs. 3408 ± 45 Hz, PTV 1.4 ± 1.6 vs. −1.5 ± 1.8, PPF 236 ± 29 vs. 220 ± 34 N; 8‐week: NF 3890 ± 39 vs. 3613 ± 31 Hz, PTV −3.2 ± 2.5 vs. −2 ± 4.3, PPF 248 ± 25 vs. 289 ± 28 N). Higher NF values for given PTV/PPF indicate potential clinical advantages. Significant differences between primary and secondary stabilities suggest osteointegration was mainly achieved in the 4‐week group.

show abstract

On the importance of precision in cortical bone drilling: Integrating experimental validation and computational modeling

Einafshar,

Rajaeirad,

Babazadeh Ghazijahani

et al. 2024

Journal of Orthopaedics

View full text Add to dashboard Cite

New Biomechanical Approach for Evaluation of Spinal Pedicle Screw Fixation Stability

Cited by 10 publications

References 40 publications

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

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

Nondestructive acoustic modal analysis for assessing bone screw stability: An ex vivo animal study

On the importance of precision in cortical bone drilling: Integrating experimental validation and computational modeling

Contact Info

Product

Resources

About