Which finding is least typical of TMJ osteoarthritis on examination?

Which finding is least typical of TMJ osteoarthritis on examination?

• A. Jaw crepitus
• B. Tenderness over the joint
• C. Reduced range of motion
• D. Increased joint mobility

Answer: (D)

TMJ osteoarthritis produces a degenerative pattern in the joint that tends to stiffen the jaw and limit movement. As the cartilage wears and osteophytes form, the joint space narrows and the capsule often becomes less flexible, so opening the mouth and other jaw movements are typically reduced. The joint often becomes tender due to ongoing wear and mild inflammation, and the roughened surfaces can produce a palpable or audible crackling or grinding, known as crepitus, when the jaw moves. Because of these structural changes, increased joint mobility is unlikely; the OA process tends to restrict motion rather than loosen it.

TMJ osteoarthritis produces a degenerative pattern in the joint that tends to stiffen the jaw and limit movement. As the cartilage wears and osteophytes form, the joint space narrows and the capsule often becomes less flexible, so opening the mouth and other jaw movements are typically reduced. The joint often becomes tender due to ongoing wear and mild inflammation, and the roughened surfaces can produce a palpable or audible crackling or grinding, known as crepitus, when the jaw moves. Because of these structural changes, increased joint mobility is unlikely; the OA process tends to restrict motion rather than loosen it.