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Morphology and mechanical function of long-term in vitro engineered cartilage
1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. mapx@umich.edu
Journal of Biomedical Materials Research
|July 9, 1999
Summary
Engineered cartilage tissue showed improved biomechanical properties with longer in vitro cultivation. This study demonstrates significant advancements in developing functional cartilage for potential therapeutic applications.
Area of Science:
- Biomedical Engineering
- Tissue Engineering
- Orthopedics
Background:
- Articular chondrocytes and poly(glycolic acid) scaffolds can engineer cartilage in vitro over 12 weeks.
- Further evolution of engineered cartilage towards natural tissue properties requires investigation.
Purpose of the Study:
- To assess the long-term in vitro evolution of engineered cartilage.
- To evaluate extracellular matrix organization and biomechanical properties, particularly aggregate modulus.
Main Methods:
- In vitro cultivation of engineered cartilage for up to 25 weeks.
- Assessment of cellularity, cell size, compressive modulus, permeability, and stress-strain response.
- Measurement of aggregate modulus over the cultivation period.
Main Results:
- Engineered cartilage properties stabilized after 12 weeks, matching natural cartilage.
- The linear range of the stress-strain curve reached that of natural cartilage after 2 weeks.
- Aggregate modulus increased from week 12 to 20, reaching 179+/-9 kPa (40% of natural cartilage) by week 20.
Conclusions:
- Longer-term in vitro cultivation enhances biomechanical properties of engineered cartilage.
- The study reports the highest aggregate modulus for in vitro engineered cartilage to date.
- Findings suggest potential for improved cartilage regeneration strategies.