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Mechanical strength of osteochondral junction.

P Kumar¹, M Oka, T Nakamura

¹Department of Artificial Locomotive System, Research Center for Biomedical Engineering, Kyoto University, Japan.

Nihon Seikeigeka Gakkai Zasshi

|November 1, 1991

Summary

The human articular cartilage-bone junction has a shear strength of 7.25 MPa, failing at the tidemark. This finding is crucial for understanding osteochondral fractures.

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Area of Science:

Orthopedic Biomechanics
Articular Cartilage Research
Skeletal Biology

Background:

The articular cartilage-bone junction is critical for joint function.
Understanding its mechanical properties is vital for treating joint injuries.
Osteochondral fractures are common and debilitating injuries.

Purpose of the Study:

To determine the shear bonding strength of the human articular cartilage-bone junction.
To compare this strength with the tensile strength of articular cartilage and shear strength of subchondral bone.
To investigate the failure site and ultrastructure of the junction.

Main Methods:

Shear testing of the articular cartilage-bone junction in adult human specimens.
Tensile testing of full-thickness articular cartilage.
Shear testing of underlying subchondral bone.
Microscopic examination (light and scanning electron microscopy) of failure sites.

Main Results:

The articular cartilage-bone junction failed at a shear strength of 7.25 +/- 1.35 MPa.
Articular cartilage tensile strength was 3.75 +/- 0.75 MPa.
Subchondral bone shear strength was 2.45 +/- 0.85 MPa.
Failures consistently occurred at the tidemark, revealing potential structural weakness.

Conclusions:

The tidemark represents a critical weak point in the articular cartilage-bone interface under shear stress.
The junction's shear strength is significantly higher than cartilage tensile strength and subchondral bone shear strength.
These findings have implications for understanding the mechanisms of osteochondral fractures.

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