title: One-step articular cartilage repair: combination of in situ bone marrow stem cells with cell-free poly(L-lactic-co-glycolic acid) scaffold in a rabbit model.
abstract: Focal full-thickness articular cartilage defects are challenging to repair. The purpose of this study was to find a simple, effective 1-step articular cartilage repair method. Because stem cell niches produce a microenvironment for stem cell self-renewal, proliferation, and differentiation, we integrated in situ bone marrow stem cells with an implanted poly(L-lactic-co-glycolic acid) (PLLGA) scaffold. Marrow stem cells grew and proliferated on cell-free PLLGA scaffolds, which were evaluated by scanning electronic microscopy (SEM) and Cell Counting Kit-8 (Dojindo, Kumamoto, Japan). Twenty-seven rabbits (54 knees) with large cylinder femoral trochlear cartilage defects were created and repaired with microfracture and cell-free PLLGA scaffold implantation (group 1), microfracture (group 2), or cell-free PLLGA scaffold implantation (group 3).Outcomes were evaluated by magnetic resonance imaging, International Cartilage Repair Society scores, histology, and immunohistochemistry. The repair effects were better in group 1 than in groups 2 and 3. In group 1, hyaline-like cartilage formed at week 24. Magnetic resonance imaging showed homogeneous signals as the adjacent normal cartilage. Collagen type II and toluidine blue were stained positively as normal cartilage tissue, and the color and thickness of regenerated tissue were similar to surrounding normal tissue. The combination of microfracture and cell-free PLLGA scaffold implantation used endogenous marrow stem cells in situ and promoted hyaline-like cartilage regeneration rapidly and effectively.
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, Beijing, China.
authors.forename: Junjun
authors.initials: J
authors.lastname: Shi
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiangzhu
authors.initials: X
authors.lastname: Zeng
authors.forename: Jingxian
authors.initials: J
authors.lastname: Zhu
authors.forename: Yanbin
authors.initials: Y
authors.lastname: Pi
authors.forename: Chunyan
authors.initials: C
authors.lastname: Zhou
authors.forename: Yingfang
authors.initials: Y
authors.lastname: Ao
mesh_terms: D000818:Animals; D054544:Arthroplasty, Subchondral; D001854:Bone Marrow Cells / Q000166:cytology* / Q000502:physiology; D002358:Cartilage, Articular / Q000293:injuries / Q000473:pathology / Q000601:surgery*; D002454:Cell Differentiation; D049109:Cell Proliferation; D019902:Chondrocytes / Q000166:cytology / Q000502:physiology; D004195:Disease Models, Animal; D048091:Guided Tissue Regeneration; D019344:Lactic Acid / Q000008:administration & dosage; D008279:Magnetic Resonance Imaging; D008297:Male; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D011091:Polyesters; D011108:Polymers / Q000008:administration & dosage; D011817:Rabbits; D012038:Regeneration; D055153:Stem Cell Niche / Q000502:physiology*; D013264:Stifle / Q000293:injuries / Q000473:pathology; D023822:Tissue Engineering; D054457:Tissue Scaffolds
chemical_list: D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide)