title: A poly(lactic-co-glycolic acid) knitted scaffold for tendon tissue engineering: an in vitro and in vivo study.
abstract: We have designed a composite scaffold for potential use in tendon or ligament tissue engineering. The composite scaffold was made of a cellularized alginate gel that encapsulated a knitted structure. Our hypothesis was that the alginate would act as a cell carrier and deliver cells to the injury site while the knitted structure would provide mechanical strength to the composite construct. The mechanical behaviour and the degradation profile of the poly(lactic-co-glycolic acid) knitted scaffolds were evaluated. We found that our scaffolds had an elastic modulus of 750 MPa and that they lost their physical integrity within 7 weeks of in vitro incubation. Autologous rabbit mesenchymal stem cell seeded composite scaffolds were implanted in a 1-cm-long defect created in the rabbit tendon, and the biomechanical properties and the morphology of the regenerated tissues were evaluated after 13 weeks. The regenerated tendons presented higher normalized elastic modulus of (60%) when compared with naturally healed tendons (40%). The histological study showed a higher cell density and vascularization in the regenerated tendons.
authors.affiliation: Group of Cell and Tissue Engineering, LEMTA, Nancy-Université, CNRS, Vandoeuvre, France. vaquettc@yahoo.fr
authors.forename: Cédryck
authors.initials: C
authors.lastname: Vaquette
authors.forename: Saïd
authors.initials: S
authors.lastname: Slimani
authors.forename: Cyril J F
authors.initials: CJ
authors.lastname: Kahn
authors.forename: Nguyen
authors.initials: N
authors.lastname: Tran
authors.forename: Rachid
authors.initials: R
authors.lastname: Rahouadj
authors.forename: Xiong
authors.initials: X
authors.lastname: Wang
mesh_terms: D000125:Achilles Tendon / Q000166:cytology* / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D000464:Alginates / Q000737:chemistry; D000818:Animals; D001696:Biomechanical Phenomena / Q000187:drug effects; D005260:Female; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000737:chemistry* / Q000494:pharmacology*; D011100:Polyglycolic Acid / Q000737:chemistry* / Q000494:pharmacology*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011817:Rabbits; D012038:Regeneration / Q000187:drug effects; D013718:Tensile Strength / Q000187:drug effects; D023822:Tissue Engineering / Q000379:methods*; D054457:Tissue Scaffolds / Q000737:chemistry*; D014783:Viscosity
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D020723:Glucuronic Acid