What is the main functional consequence of degenerative changes in the TMJ cartilage?

What is the main functional consequence of degenerative changes in the TMJ cartilage?

• A. Increased joint mobility
• B. No symptoms
• C. Hypermobility
• D. Reduced joint mobility and pain

Answer: (D)

Degenerative changes in the TMJ cartilage primarily impair smooth joint movement, leading to reduced mobility and pain during jaw use. The TMJ’s articular surfaces are fibrocartilage designed for resilient, friction-minimized movement between the condyle and the fossa. When this cartilage degenerates, it becomes thinner and rougher, increasing friction as the jaw glides and chews. This rough surface, sometimes with accompanying bone changes and synovial inflammation, activates pain signals and often triggers protective muscle guarding. The result is a narrowing of the jaw’s range of motion and discomfort with function, rather than easier movement or a lack of symptoms.

Degenerative changes in the TMJ cartilage primarily impair smooth joint movement, leading to reduced mobility and pain during jaw use. The TMJ’s articular surfaces are fibrocartilage designed for resilient, friction-minimized movement between the condyle and the fossa. When this cartilage degenerates, it becomes thinner and rougher, increasing friction as the jaw glides and chews. This rough surface, sometimes with accompanying bone changes and synovial inflammation, activates pain signals and often triggers protective muscle guarding. The result is a narrowing of the jaw’s range of motion and discomfort with function, rather than easier movement or a lack of symptoms.