Directional cartilage scaffold for the repair of articular cartilage injury caused by exercise

doi:10.3969/j.issn.2095-4344.2017.02.009

Abstract

Abstract:

BACKGROUND: Cartilage scaffold plays an important role in articular cartilage injury, but it is still restricted in practice, leading to the repair failure using tissue-engineered cartilage.
OBJECTIVE: To explore the preparation method of cartilage scaffold with directional structure and its repairing effect in cartilage injury of rabbits.
METHODS: Directional cartilage scaffolds were prepared by temperature gradient induced phase separation technique. The cross-linking of cartilage scaffold was completed with genipin. The physical and mechanical properties of scaffolds were determined. Forty-eight white rabbits were modeled into exercised-induced articular cartilage injury and equivalently randomized into two groups, followed by implantation of non-directional or directional scaffolds. Samples were collected at postoperative 6, 12 and 24 weeks to compare the repair effect of two scaffolds on rabbit joint injury.
RESULTS AND CONCLUSION: Scanning electron microscope showed that the regular microstructures on the longitudinal section of directional scaffolds were aligned in the same direction, while the longitudinal and transverse planes of the non-directional scaffolds showed porous honeycomb structures. The elastic modulus of the directional scaffold was significantly higher than that of the non-directional scaffold (P < 0.05). O’Driscoll histological scores in the directional scaffold group were significantly higher than those in the non-directional scaffold group at 6, 12 and 24 weeks postoperatively (P < 0.05). At postoperative 24 weeks, in the directional scaffold group, the three-dimensional reconstruction of the rabbit defect region was flat and smooth, and coronal two-dimensional scanning showed the cartilage thickness of the newborn cartilage was very close to that of the normal bone; the cartilage surface in the non-directional rabbits was flat under three-dimensional CT, and coronal two-dimensional scanning showed that the repaired cartilage was almost the same as the normal cartilage. Hematoxylin-eosin staining showed that at 24 weeks postoperatively, the defect site disappeared and the cartilage cells arranged in the vertical direction in the directional scaffold group. There were typical cartilage lacunae at the defect site in the non-directional scaffold group at 24 weeks postoperatively. Our findings suggest that the directional cartilage scaffold prepared using temperature gradient induced phase separation technique holds good physical and mechanical properties, and its implantation into the rabbit articular cartilage injury induced by exercise can promote the injury repair to obtain ideal mechanical properties.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

Key words: Stents, Cartilage, Histology, Biomechanics, Tissue Engineering

CLC Number:

R318

Zhao Xia1, Guo Qiu-lin2. Directional cartilage scaffold for the repair of articular cartilage injury caused by exercise[J]. Chinese Journal of Tissue Engineering Research, 2017, 21(2): 209-214.

Figures/Tables 6

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