Which biological theory explains osteoarthritis in a former football player due to wear from use?

Which biological theory explains osteoarthritis in a former football player due to wear from use?

• A. Cross-link
• B. Free radical
• C. Wear-and-tear
• D. Somatic DNA damage

Answer: (C)

Osteoarthritis in a person with years of repetitive joint use is best explained by wear-and-tear. The idea is that mechanical stress from activity slowly wears down the articular cartilage. With repeated microtrauma and loading, cartilage loses its smooth surface, proteoglycans decline, and the matrix deteriorates. Chondrocytes can’t fully repair the damage, so cracks form, cartilage erodes, and the underlying bone becomes exposed and reacts by thickening and forming osteophytes. Over time this leads to joint space narrowing, pain with use, and reduced function—common in athletes who put heavy, repetitive load on joints. The other theories describe broader aging processes but don’t specifically account for degeneration driven by mechanical wear. Cross-linking involves collagen stiffening from chemical changes; free radical theory emphasizes oxidative damage; somatic DNA damage involves accumulated mutations. While these contribute to aging in general, they don’t directly explain osteoarthritis as a wear-induced degenerative joint condition.

Osteoarthritis in a person with years of repetitive joint use is best explained by wear-and-tear. The idea is that mechanical stress from activity slowly wears down the articular cartilage. With repeated microtrauma and loading, cartilage loses its smooth surface, proteoglycans decline, and the matrix deteriorates. Chondrocytes can’t fully repair the damage, so cracks form, cartilage erodes, and the underlying bone becomes exposed and reacts by thickening and forming osteophytes. Over time this leads to joint space narrowing, pain with use, and reduced function—common in athletes who put heavy, repetitive load on joints.

The other theories describe broader aging processes but don’t specifically account for degeneration driven by mechanical wear. Cross-linking involves collagen stiffening from chemical changes; free radical theory emphasizes oxidative damage; somatic DNA damage involves accumulated mutations. While these contribute to aging in general, they don’t directly explain osteoarthritis as a wear-induced degenerative joint condition.