Local delivery of autologous platelet in collagen matrix simulated in situ articular cartilage repair.
Bone marrow released by microfracture or full-thickness cartilage defect can initiate the in situ cartilage repair. However, it can only repair small cartilage defects (<2 cm(2)). This study aimed to investigate whether autologous platelet-rich plasma (PRP) transplantation in collagen matrix can improve the in situ bone marrow-initiated cartilage repair. Full-thickness cartilage defects (diameter 4 mm, thickness 3 mm) in the patellar grooves of male New Zealand White rabbits were chosen as a model of in situ cartilage repair. They were treated with bilayer collagen scaffold (group II), PRP and bilayer collagen scaffold (group III), and untreated (group I), respectively (n = 11). The rabbits were sacrificed at 6 and 12 weeks after operation. The repaired tissues were processed for histology and for mechanical test. The results showed that at both 6 and 12 weeks, group III had the largest amounts of cartilage tissue, which restored a larger surface area of the cartilage defects. Moreover, group III had higher histological scores and more glycosaminoglycans (GAGs) content than those in the other two groups (p < 0.05). The Young's modulus of the repaired tissue in group II and group III was higher than that of group I (p < 0.05). Autologous PRP and bilayer collagen matrix stimulated the formation of cartilage tissues. The findings implicated that the combination of PRP with collagen matrix may repair larger cartilage defects that currently require complex autologous chondrocyte implantation (ACI) or osteochondral grafting.
Qi
Yi Ying
YY
Center for Stem Cell and Tissue Engineering, School of Medicine, Zhejiang University, Hangzhou, China.
Chen
Xiao
X
Jiang
Yang Zi
YZ
Cai
Hong Xin
HX
Wang
Lin Lin
LL
Song
Xing Hui
XH
Zou
Xiao Hui
XH
Ouyang
Hong Wei
HW
D000818:Animals; D002358:Cartilage, Articular / Q000293:injuries* / Q000473:pathology; D003094:Collagen / Q000627:therapeutic use*; D050724:Fractures, Cartilage / Q000473:pathology / Q000628:therapy*; D006025:Glycosaminoglycans / Q000378:metabolism; D008297:Male; D053657:Platelet-Rich Plasma; D011817:Rabbits; D023822:Tissue Engineering / Q000379:methods; D054457:Tissue Scaffolds; D014182:Transplantation, Autologous
D006025:Glycosaminoglycans; D003094:Collagen