Zone-dependent mechanical properties of human articular cartilage obtained by indentation measurements

J Mater Sci Mater Med. 2018 May 4;29(5):57. doi: 10.1007/s10856-018-6066-0.

Abstract

Emerging 3D printing technology permits innovative approaches to manufacture cartilage scaffolds associated with layer-by-layer mechanical property adaptation. However, information about gradients of mechanical properties in human articular cartilage is limited. In this study, we quantified a zone-dependent change of local elastic modulus of human femoral condyle cartilage by using an instrumented indentation technique. From the cartilage superficial zone towards the calcified layer, a gradient of elastic modulus values between 0.020 ± 0.003 MPa and 6.44 ± 1.02 MPa was measured. To validate the tissue quality, the histological tissue composition was visualized by glycosaminoglycan and collagen staining. This work aims to introduce a new protocol to investigate the zone-dependent mechanical properties of graded structures, such as human articular cartilage. From this knowledge, better cartilage repair strategies could be tailored in the future.

MeSH terms

  • Biomechanical Phenomena / physiology*
  • Bone and Bones / pathology
  • Bone and Bones / physiology
  • Cartilage, Articular / cytology
  • Cartilage, Articular / pathology
  • Cartilage, Articular / physiology*
  • Collagen / analysis
  • Elastic Modulus*
  • Extracellular Matrix / chemistry
  • Femur / pathology
  • Femur / physiology
  • Glycosaminoglycans / analysis
  • Histological Techniques
  • Humans
  • Materials Testing
  • Stress, Mechanical*
  • Tissue Scaffolds / chemistry*

Substances

  • Glycosaminoglycans
  • Collagen

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