Comparison of the compressive mechanical properties of auricular and costal cartilage from patients with microtia.

Journal of Biomechanics
M F GriffinP E Butler

Abstract

Children born with a small or absent ears undergo surgical reconstruction to restore their auricle. Currently, rib (costal) cartilage is used to carve the auricle. However as alternative, tissue engineered and synthetic materials are being developed to restore the auricle shape to overcome donor site morbidity and limited availability of rib cartilage. However, to date there is limited knowledge regarding the mechanical properties of the auricular and costal cartilage to optimise the required compressive properties of the graft. The remnant auricular and costal cartilage from 20 patients undergoing stage-1 microtia surgery was harvested. On the day of surgery, the cartilage was evaluated in compression, with each sample loaded to 300 g at 1 mm/s. RESULTS: The costal cartilage was observed to have a significantly higher Young's Elastic Modulus than auricular cartilage (average costal cartilage 11.43 MPa vs average auricular cartilage 2 MPa, p < 0.0001). The auricular cartilage showed a significantly higher relaxation rate than costal cartilage (average costal cartilage 0.72 MPa10-4 vs average auricular cartilage 1.93 MPa10-4, p < 0.05). The final absolute relaxation was significantly lower for elastic cartilage than costal carti...Continue Reading

Citations

Apr 23, 2021·Journal of the Mechanical Behavior of Biomedical Materials·Sean S Kohles
Jul 2, 2021·Scientific Reports·Matthias WeberAnja Niehoff
Jul 28, 2021·Journal of Biomechanics·Hefeng SunQinghua Yang

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