Orbital stress analysis, Part IV: Use of a "stiffness-graded" biodegradable implants to repair orbital blow-out fracture

The Journal of Craniofacial Surgery
Jehad Al-SukhunNureddin Ashammakhi

Abstract

The purpose of this study was to develop a finite element model (FEM) of a human orbit, of 1 patient, who had an orbital blow-out fracture, to study the effect of using a "stiffness-graded" (SG) biodegradable implant on the biomechanics of bone-fracture repair. An FEM of the orbit and the globe, of 1 patient who had an orbital blow-out fracture and was treated with biodegradable poly-L/DL-lactide [P(L/DL)LA 70/30], was generated based on computed tomography scan images. Simulations were performed with a computer using a commercially available finite element software. The FEM was then used to study the effect of using an SG biodegradable implant on the stress distribution in the fractured bone. This was compared with the stress distribution at the fracture interface and at the bone-implant interface, when using P(L/DL)LA implant with a uniform stiffness. The use of SG implants caused less stress shielding to the fractured bone. At 50% of the bone healing stage, stress at the fracture interface was compressive in nature, that is, 0.2 MPa for the uniform implant, whereas SG implants resulted in tensile stress of 0.2 MPa. The result was that SG implants allowed the 50% healed bone to participate in loadings. Stiffness-graded implan...Continue Reading

References

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Jul 21, 2011·The Journal of Craniofacial Surgery·Jehad Al-SukhunNureddin Ashammakhi

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Citations

Oct 6, 2018·Journal of Stomatology, Oral and Maxillofacial Surgery·J M FolettiL Guyot

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