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Perforations occur in the articular discs of human temporomandibular joints. They are of three types, based on location: lateral, central, and posterior. The lateral and central perforations occur in essentially equal numbers while the posterior perforations are uncommon (less than 10%). Lateral perforations occur primarily in edentulous individuals and are equally distributed between males and females. Central perforations occur most often in dentulous females. Posterior perforations occur only in edentulous persons and are equally distributed between males and females. No clear evidence of anterior disc displacement (internal derangement) was seen.