Two clicks during jaw movement upon opening and closing the jaw typically indicate what condition?

Two clicks during jaw movement, specifically during both the opening and closing of the jaw, suggest the presence of disc displacement with reduction. This condition occurs when the articular disc within the temporomandibular joint (TMJ) initially displaces from its normal position as the jaw opens, leading to a click as the disc repositions itself when the jaw is fully opened or closed. The clicking sounds indicate that the disc is moving back into its proper alignment with the condyle during these movements, which is characteristic of disc displacement with reduction.

In contrast, if there were a single click only during one of the phases (either opening or closing), this could indicate that the disc is failing to return to its normal position effectively, which aligns more closely with disc displacement without reduction. Normal joint movement typically would not produce any clicking sounds, indicating smooth and unimpeded mobility of the TMJ, while jaw osteoarthritis would generally present with more degenerative signs and possibly crepitus rather than distinct clicks. Thus, the presence of two clicks during both opening and closing strongly points towards the diagnosis of disc displacement with reduction.