An experimental study of pressure–volume dynamics of casting materials

Deshpande, Shreeram V.

doi:10.1016/j.injury.2005.02.003

Cited by 8 publications

(12 citation statements)

References 19 publications

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“…This fabric could be used as a wearable cast for bone injuries (Figure B on the right and Movie S5, Supporting Information): it can adapt to different anatomies and sizes and, once solid, it can immobilize the area during the healing process. In addition, it is breathable, more hygienic, and faster than conventional plaster (e.g., synthetic cast materials need a curing time of more than 30 min). The load‐bearing capability of the fabric can be increased either by using a larger LMPA core as long as the total mass of the tissue is comfortable (see Text S4, Supporting Information) or by different knitting patterns and mesh sizes that result in higher direction‐specific rigidity.…”

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confidence: 99%

Variable Stiffness Fiber with Self‐Healing Capability

et al. 2016

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confidence: 99%

Variable Stiffness Fiber with Self‐Healing Capability

et al. 2016

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“…Compliance between fiberglass and POP has been compared in previous studies. Fiberglass was shown to require a greater volume change to generate the same pressure rise during the initial stages of swelling[ 13 ]. However, once a certain pressure threshold had been exceeded, fiberglass pressures were found to rise steeply with less volume change.…”

Section: Discussionmentioning

confidence: 99%

“…These properties are presumed to allow relaxation within the materials over a constant volume distention, ultimately allowing pressures to reduce. Clinically this is advantageous as otherwise peak pressures generated by both materials would be much higher and sustained for longer periods[ 13 ]. In view of the persistently higher pressures demonstrated by fiberglass casts in this study, the authors advocate POP casts over fiberglass for injured lower limbs in the acute phase, particularly for the first 24 h.…”

Section: Discussionmentioning

confidence: 99%

Lower limb intracast pressures generated by different types of immobilisation casts

Chaudhury¹,

Hazlerigg²,

Vusirikala³

et al. 2017

WJO

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AIMTo determine if complete, split casts and backslabs [plaster of Paris (POP) and fiberglass] generate different intracast pressures and pain.METHODSIncreased swelling within casts was modeled by a closed water system attached to an expandable bag placed directly under different types of casts applied to a healthy lower limb. Complete fiberglass and POP casts, split casts and backslabs were applied. Twenty-five milliliter aliquots of saline were injected into the system and the generated intracast pressures were measured using a sphygmomanometer. The subject was blinded to the pressure scores to avoid bias. All casts were applied to the same right limb on the same subject to avoid the effects of variations in anatomy or physiology on intracast pressures. Pain levels were evaluated using the Visual Analogue Score after each sequential saline injection. Each type of cast was reapplied four times and the measurements were repeated on four separate occasions. Sample sizes were determined by a pre-study 90% power calculation to detect a 20% difference in intracast pressures between cast groups.RESULTSA significant difference between the various types of casts was noted when the saline volume was greater than 100 mL (P = 0.009). The greatest intracast pressure was generated by complete fiberglass casts, which were significantly higher than complete POP casts or backslabs (P = 0.018 and P = 0.008 respectively) at intracast saline volumes of 100 mL and higher. Backslabs produced a significantly lower intracast pressure compared to complete POP only once the saline volume within casts exceeded 225 mL (P = 0.009). Intracast pressures were significantly lower in split casts (P = 0.003). Split POP and fiberglass casts produced the lowest intracast pressures, even compared to backslabs (P = 0.009). Complete fiberglass casts generated the highest pain levels at manometer pressures of 75 mmHg and greater (P = 0.001). Split fiberglass casts had significantly reduced pain levels (P = 0.001). In contrast, a split complete POP cast did not produce significantly reduced pain levels at pressures between 25-150 mmHg. There was no difference in pain generated by complete POP and backslabs at manometer pressures of 200 mmHg and lower.CONCLUSIONFibreglass casts generate significantly higher intracast pressures and pain than POP casts. Split casts cause lower intracast pressures regardless of material, than complete casts and backslabs.

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“…For example, the results of this study agree with those of pressure-volume and skin pressure studies conducted by Deshpande et al and Davids et al, as those studies showed that SRF was more compliant than RF. 10,11 In addition, their findings suggest that RF most rigid of all cast materials tested they tested Results in these studies were determined by gauging the pressure change when infusing measured volumes of fluid into bladders that surrounded by cast material. Discrepancies with other studies' results could be attributed to the complex combination of motion, padding, and/or multilayering effect that were based on the standard clinical procedure (Ponseti method) that was applied.…”

Section: Discussionmentioning

confidence: 99%

“…8,10,11,12,13,14 A variety of metrics have been investigated to define material properties, such as stiffness, ultimate strength, and yield strength, or the point at which the material will begin to plastically deform, based on tests performed in compression, tension, and bending. One limitation of these studies is that these tests are based on models that do not adequately represent the clinical application.…”

Section: Introductionmentioning

confidence: 99%

Creep evaluation of (orthotic) cast materials during simulated clubfoot correction

Cohen

Altıok

Tarima

et al. 2012

2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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The Ponseti method is a widely accepted and highly successful conservative treatment of pediatric clubfoot that relies on weekly manipulations and cast applications. However, the material behavior of the cast in the Ponseti technique has not been investigated. The current study sought to characterize the ability of two standard casting materials to maintain the Ponseti corrected foot position by evaluating creep response. A dynamic cast testing device (DCTD) was built to simulate a typical pediatric clubfoot. Semi-rigid fiberglass and rigid fiberglass casting materials were applied to the device, and the rotational creep was measured at various constant torques. The movement was measured using a 3D motion capture system. A 2-way ANOVA was performed on the creep displacement data at a significance level of 0.05. Among cast materials, the rotational creep displacement was found to be significantly different (p-values ≪ 0.001). The most creep displacement occurs in the semi-rigid fiberglass (approximately 1.0 degrees), then the rigid fiberglass (approximately 0.4 degrees). There was no effect of torque magnitude on the creep displacement. All materials maintained the corrected position with minimal change in position over time.

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An experimental study of pressure–volume dynamics of casting materials

Cited by 8 publications

References 19 publications

Variable Stiffness Fiber with Self‐Healing Capability

Variable Stiffness Fiber with Self‐Healing Capability

Lower limb intracast pressures generated by different types of immobilisation casts

Creep evaluation of (orthotic) cast materials during simulated clubfoot correction

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