In temporomandibular joint disorders what is the difference between Internal disc derangement with reduction and internal disc derangement without reduction?
Internal derangements can be either or both soft-tissue or bony.
There are two basic types of soft-tissue internal derangements. The
more common is referred to as an internal derangement with
reduction; the disc slides into and out of its normal functional
position as the jaw opens or closes, causing the popping sound
characteristic of TMD. In cases of internal derangement without
reduction, the disc is permanently displaced or dislocated to an
incorrect position, and the jaw's range of motion is limited.