title: Poly(lactic-co-glycolic acid) conduit for repair of injured sciatic nerve: A mechanical analysis.
abstract: Tensile stress and tensile strain directly affect the quality of nerve regeneration after bridging nerve defects by poly(lactic-co-glycolic acid) conduit transplantation and autogenous nerve grafting for sciatic nerve injury. This study collected the sciatic nerve from the gluteus maximus muscle from fresh human cadaver, and established 10-mm-long sciatic nerve injury models by removing the ischium, following which poly(lactic-co-glycolic acid) conduits or autogenous nerve grafts were transplanted. Scanning electron microscopy revealed that the axon and myelin sheath were torn, and the vessels of basilar membrane were obstructed in the poly(lactic-co-glycolic acid) conduit-repaired sciatic nerve following tensile testing. There were no significant differences in tensile tests with autogenous nerve graft-repaired sciatic nerve. Following poly(lactic-co-glycolic acid) conduit transplantation for sciatic nerve repair, tensile test results suggest that maximum tensile load, maximum stress, elastic limit load and elastic limit stress increased compared with autogenous nerve grafts, but elastic limit strain and maximum strain decreased. Moreover, the tendencies of stress-strain curves of sciatic nerves were similar after transplantation of poly(lactic-co-glycolic acid) conduits or autogenous nerve grafts. Results showed that after transplantation in vitro for sciatic nerve injury, poly(lactic-co-glycolic acid) conduits exhibited good intensity, elasticity and plasticity, indicating that poly(lactic-co-glycolic acid) conduits are suitable for sciatic nerve injury repair.
authors.affiliation: Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun 130031, Jilin Province, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Yu
authors.affiliation: Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun 130031, Jilin Province, China.
authors.forename: Changfu
authors.initials: C
authors.lastname: Zhao
authors.affiliation: Department of Engineering Mechanics, Nanling Campus of Jilin University, Changchun 130022, Jilin Province, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.affiliation: Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun 130031, Jilin Province, China.
authors.forename: Guangyao
authors.initials: G
authors.lastname: Liu
authors.affiliation: Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun 130031, Jilin Province, China.
authors.forename: Min
authors.initials: M
authors.lastname: Luo
keywords: grants-supported paper; injury model; mechanical property; neural regeneration; neuroregeneration; peripheral nerve injury; poly(lactic-co-glycolic acid); sciatic nerve; strain; stress; transplantation