Case-based: A 28-year-old woman with intermittent jaw pain and occasional clicking for 6 months. Pain worsens with chewing and at the end of the day; opening range is 40 mm with a 5 mm deviation to the right; exam shows tender masseter and lateral pterygoid and a right-sided click on opening. MRI shows anterior disc displacement with reduction. Which diagnosis and initial management would you propose?

Case-based: A 28-year-old woman with intermittent jaw pain and occasional clicking for 6 months. Pain worsens with chewing and at the end of the day; opening range is 40 mm with a 5 mm deviation to the right; exam shows tender masseter and lateral pterygoid and a right-sided click on opening. MRI shows anterior disc displacement with reduction. Which diagnosis and initial management would you propose?

• A. Diagnosis: Disc displacement with reduction; Initial management: conservative therapy including patient education, soft diet, gentle jaw exercises, physical therapy, and a stabilization splint; NSAIDs as needed; re-evaluate in 6–8 weeks
• B. Diagnosis: Osteoarthritis of TMJ; Management: total joint replacement
• C. Trismus due to infection; Management: IV antibiotics
• D. Myofascial pain syndrome; Management: only occlusal adjustment

Answer: (A)

Anterior disc displacement with reduction explains a jaw that functions with a mechanical click: the disc sits anterior to the condyle when the mouth is closed and reduces to its normal position during opening, generating a characteristic click. The clinical picture fits: intermittent jaw pain worsened by chewing and by the end of the day, a normal-to-mildly reduced opening (40 mm) with a small deviation to one side, tenderness in the muscles of mastication, and a clear click on opening, with MRI confirming anterior disc displacement that reduces. The best first-step management is conservative: educate the patient about the condition, encourage a soft diet and avoidance of hard or chewy foods, prescribe gentle jaw exercises and, if needed, physical therapy to improve function, use a stabilization splint to reduce clenching and stabilize joint position, and NSAIDs for pain as needed. Re-evaluate in 6–8 weeks to monitor improvement. This approach is preferred because ADD with reduction often responds to noninvasive measures, and surgical options or more aggressive treatments aren’t indicated unless symptoms persist or escalate. The other possibilities don’t fit as well: osteoarthritis would typically show degenerative changes and may require more invasive management; trismus from infection would present with systemic signs; myofascial pain syndrome lacks a true disc-related clicking on opening; and occlusal adjustment alone isn’t an effective treatment for ADD with reduction.

Anterior disc displacement with reduction explains a jaw that functions with a mechanical click: the disc sits anterior to the condyle when the mouth is closed and reduces to its normal position during opening, generating a characteristic click. The clinical picture fits: intermittent jaw pain worsened by chewing and by the end of the day, a normal-to-mildly reduced opening (40 mm) with a small deviation to one side, tenderness in the muscles of mastication, and a clear click on opening, with MRI confirming anterior disc displacement that reduces. The best first-step management is conservative: educate the patient about the condition, encourage a soft diet and avoidance of hard or chewy foods, prescribe gentle jaw exercises and, if needed, physical therapy to improve function, use a stabilization splint to reduce clenching and stabilize joint position, and NSAIDs for pain as needed. Re-evaluate in 6–8 weeks to monitor improvement. This approach is preferred because ADD with reduction often responds to noninvasive measures, and surgical options or more aggressive treatments aren’t indicated unless symptoms persist or escalate. The other possibilities don’t fit as well: osteoarthritis would typically show degenerative changes and may require more invasive management; trismus from infection would present with systemic signs; myofascial pain syndrome lacks a true disc-related clicking on opening; and occlusal adjustment alone isn’t an effective treatment for ADD with reduction.