Evaluating compressive properties and morphology of expandable polyurethane foam for use in a synthetic paediatric spine

Muhayudin, Nor Amalina; Basaruddin, Khairul Salleh; McEvoy, Fiona; Tansey, Anthony

doi:10.1016/j.jmrt.2019.12.089

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…After three coatings, no effect on the mechanical property of the melamine sponge was noticed, meanwhile an increment in the compression stress modulus of the composite was noticed (S.I.). It is understood to be due to the increase in apparent density of the sponge caused by the MOF loading [47]. Overall, these results demonstrate the advantage of employing sponge as a substrate to obtain a structured adsorbent over other forms and structures such as beads, pellets or monoliths, [13].…”

Section: Mg-mof-74@ms Compositementioning

confidence: 65%

An ultra-permeable hybrid Mg-MOF-74-Melamine sponge composite for fast dynamic gas separation

Sharma¹,

Sürmeli²,

Assche³

et al. 2022

Microporous and Mesoporous Materials

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Section: Mg-mof-74@ms Compositementioning

confidence: 65%

An ultra-permeable hybrid Mg-MOF-74-Melamine sponge composite for fast dynamic gas separation

Sharma¹,

Sürmeli²,

Assche³

et al. 2022

Microporous and Mesoporous Materials

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“…Although the ROM in lateral bending and axial rotation from these FSUs were within the range provided by literature, the average was lower as compared to other FSUs. As suggested by Muhayudin et al and White and Panjabi, specimen weight played a significant effect on the anatomical spine dimension, which may subsequently affect the ROM and in this research, whereby it significantly affected the flexion/extension [28,29]. Therefore, by considering the differences in flexion/extension between current study and literature, the results of porcine spine from this study were used in the comparative analysis with synthetic paediatric spine.…”

Section: Discussionmentioning

confidence: 84%

“…Another important factor that was considered while developing the synthetic paediatric spine was the actual size of human paediatric spine. Assuming that size of the paediatric spine is 100%, the size of adult spine is normally scaled up to 141%, and the size of porcine spine is larger than an adult spine by an average difference of 50% [ 4 , 27 , 28 ]. Therefore, the porcine spine size is approximately 190% as compared to paediatric spine.…”

Section: Methodsmentioning

confidence: 99%

Experimental Analysis of Fabricated Synthetic Midthoracic Paediatric Spine as Compared to the Porcine Spine Based on Range of Motion (ROM)

Muhayudin

Basaruddin

Daud

et al. 2021

Applied Bionics and Biomechanics

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The present study is aimed at investigating the mechanical behaviour of fabricated synthetic midthoracic paediatric spine based on range of motion (ROM) as compared to porcine spine as the biological specimen. The main interest was to ensure that the fabricated synthetic model could mimic the biological specimen behaviour. The synthetic paediatric spine was designed as a 200% scaled-up model to fit into the Bionix Servohydraulic spine simulator. Biomechanical tests were conducted to measure the ROM and nonlinearity of sigmoidal curves at six degrees of freedom (DOF) with moments at ±4 Nm before the specimens failed. Results were compared with the porcine spine (biological specimen). The differences found between the lateral bending and axial rotation of synthetic paediatric spine as compared to the porcine spine were 18% and 3%, respectively, but was still within the range. Flexion extension of the synthetic spine is a bit stiff in comparison of porcine spine with 45% different. The ROM curves of the synthetic paediatric spine exhibited nonlinearities for all motions as the measurements of neutral zone (NZ) and elastic zone (EZ) stiffness were below “1.” Therefore, it showed that the proposed synthetic paediatric spine behaved similarly to the biological specimen, particularly on ROM.

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“…To date, the applicability of PU foam test results has been limited because the procedures, analyses and interpretations provide little reference to in vivo applications. Also in other fields of orthopaedic surgery and research, PU foam models have receive more interest because of improvement in production techniques with more sophisticated compositions available to recreate in vivo conditions [16]. In vivo conditions should be imitated as accurately as possible to objectively discuss the quality characteristics of osteosynthesis screws [12].…”

Section: Discussionmentioning

confidence: 99%

Pull-out forces of headless compression screws in variations of synthetic bone models imitating different types of scaphoid fractures in good bone quality

Erhart

Unger

Trulson

et al. 2020

J Mater Sci: Mater Med

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Screw osteosynthesis using headless compression screws has become the accepted gold standard for the surgical treatment of scaphoid fractures. Optimal screw specifications remain controversially discussed. We aimed to investigate the influence of bone model composition on screw stability tests using headless compression screws in different scaphoid fracture models. We conducted pull-out tests using Acutrak2 ® mini, HCS ® , HKS ® , HBS ® , Herbert/Whipple ® and Twinfix ® screws. To imitate cortical and cancellous bone, two-layer polyurethane (PU) models with two distinct densities were produced. The cylinders were cut at different positions to replicate fracture localisations at increasing distances. The maximum pull-out force required to achieve up to 1 mm of pull-out distance (N to 1 mm) was measured. Acutrak2 ® mini and HCS ® followed by Twinfix ® showed the greatest average pull-out forces. N to 1 mm was, on average, greater in the cortico-cancellous model than in the cancellous cylinder with the Acutrak2 ® mini and the Herbert/Whipple ® screws, while it was the least with the HBS ® and the Twinfix ® screws; there were also differences between the HCS ® and HKS ®. There were no differences between the different fracture simulations in the synthesis strength using either the HKS ® or HBS ®. The pull-out forces of the HCS ® and Twinfix ® remained high also in simulations with the smaller screw base fragments. Varying imitations of cancellous and cortico-cancellous bone and fracture localisation reveal important information about the ex vivo strength of screw syntheses. The grip of the cortical structure should be used with the screws that fit more firmly in cortico-cancellous bone.

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Evaluating compressive properties and morphology of expandable polyurethane foam for use in a synthetic paediatric spine

Cited by 10 publications

References 21 publications

An ultra-permeable hybrid Mg-MOF-74-Melamine sponge composite for fast dynamic gas separation

An ultra-permeable hybrid Mg-MOF-74-Melamine sponge composite for fast dynamic gas separation

Experimental Analysis of Fabricated Synthetic Midthoracic Paediatric Spine as Compared to the Porcine Spine Based on Range of Motion (ROM)

Pull-out forces of headless compression screws in variations of synthetic bone models imitating different types of scaphoid fractures in good bone quality

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