TMJ is an acronym for "Temporomandibular Joint." The TMJ is a complex joint, similar to the knee, because it has multiple dimensions of movement in normal activity - it can rotate and translate.
During normal jaw opening, the TMJ first rotates, then translates along the fossa, or joint socket, and it is supported by a lubricating disc. Since the TMJ is a very complex joint, it is very susceptible to trauma. The trauma can lead to problems of the joint, also known as TMJ dysfunction, or TMD.
So when people say they are affected by "TMJ" they actually are talking about the condition known as TMJ dysfunction or TMD!
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