RDC group Number of
subjects
Muscle disorders
Myofascial pain 71
Myofascial pain with limited opening 16
Disc displacements
Disc displacement with reduction 36
Disc displacement without reduction, with limited opening 0
Disc displacement without reduction, without limited opening 1
Arthralgia, arthritis, arthrosis
Arthralgia 61
Osteoarthritis of the temporomandibular joint 1
Osteoarthrosis of the temporomandibular joint 0

RDC/TMD = research diagnostic criteria for temporomandibular disorders;
RDC = research diagnostic criteria.