Table 1 Grouping of joint disc displacement and degree
From: Relationship between temporomandibular joint space and articular disc displacement
Group | Degree of disc displacement | Disc–condyle angle(°) | Number of joint sides |
|---|---|---|---|
A | normal disc position | − 15—15 | 40 |
B | mild ADD | 16—50 | 44 |
C | moderate ADD | 51—80 | 36 |
D | severe ADD |  ≥ 81 | 52 |
E | posterior displacement |  ≤ − 16 | 44 |
total | Â | Â | 216 |