Preliminary studies on repairing osteochondral defects in the rabbit knee joint by using porous PA66/n-HA combination mesenchymal stem cells.
- Author:
Jiaqi WU
1
;
Tianfu YANG
;
Yang LIU
;
Tao GUO
;
Yuanhua MU
;
Yubao LI
Author Information
1. Department of Orthopaedics, West China Hospital of Sichuan University, Chengdu 610041, China.
- Publication Type:Journal Article
- MeSH:
Animals;
Biocompatible Materials;
Bone Substitutes;
chemical synthesis;
Female;
Hydroxyapatites;
Implants, Experimental;
Knee Injuries;
surgery;
therapy;
Male;
Mesenchymal Stem Cell Transplantation;
Nanoparticles;
Nylons;
Porosity;
Rabbits
- From:
Journal of Biomedical Engineering
2008;25(6):1349-1353
- CountryChina
- Language:Chinese
-
Abstract:
We have investigated the effects of repairing knee osteochondral defects in rabbit by using porous polyamide 66/nano-Hydroxyapatite (PA66/n-HA) combination bone marrow mesenchymal stem cells (MSCs). Eighteen 6-month-old New Zealand rabbits were used to produce the models of 4 mm x 4 mm osteochondral defect in the middle trochlea groove of femur. These models were randomly divided into 3 groups: PA66/n-HA + MSCs Group (Group A), PA66/n-HA group (Group B) and Operation control-group (Group C) in which operation for osteochondral defects was performed but neither material nor cells were implanted. The materials in Group A were seeded with MSCs (5 x 10(5)) in vitro before being implanted in to defects. The materials in groups A and B were 0.5 - 0.8 mm lower than normal cartilage. The animals were killed 1 and 4 months after operation. We assessed the effects by means of macroscopic observation, HE staining, toluidine blue staining, immunohistochemistry assay for type I and type II collagen. Group A displayed a little effect at the 1 month, but at the 4th month, Group A showed better results,compared to Groups B and C. At this time point, the repair tissue of Group A was regular; it presented more metachromatic substance visualized by toluidine blue staining, and it expressed type II collagen(+ +) and type I collagen(+). These results demonstrate that the repair tissue in Group A is nearly hyaline cartilage. So we presume that porous PA66/n-HA provides biomechanical support, and at the same time, MSCs enhance the repair effects.
