Internal Disc Derangement (IDD) in TMJ: Reduction vs. Non-Reduction

Internal derangement with reduction (IDRR) occurs when the disc is displaced from its normal position but can still return to its normal position on its own. This is the most common type of TMJ disorder.

Internal derangement without reduction (IDWOR) occurs when the disc is displaced from its normal position and cannot return to its normal position on its own. This is a less common type of TMJ disorder.

Both IDRR and IDWOR can cause pain, clicking, popping, and locking of the jaw. However, IDWOR can also cause more severe symptoms, such as difficulty opening the mouth, headaches, and dizziness.

Treatment for IDRR and IDWOR typically involves conservative measures, such as pain relievers, ice packs, and physical therapy. In some cases, surgery may be necessary to correct the problem.