Fig. 7

Flattening of the articular eminence and glenoid fossa and condyle in the sagittal view. a Both Grade 0. b Fossa grade 0. Condyle grade 1, subtle anterior flattening. c Fossa grade 1, mild widening or flattening. Condyle grade 2, mild flattening, involves part of the surface of the condyle. d Fossa grade 1 mild to moderate widening or flattening. Condyle grade 3, moderate flattening, loss of height of the condyle. e Fossa grade 1, moderate widening or flattening. Condyle grade 3, moderate flattening and loss of height of the condyle. f Fossa grade 2, severely flattened fossa/eminence. Condyle grade 3, severe flattening, involves the entire surface of the condyle and loss of height of the condyle. Note also the irregularities (asterisk) in the articular eminence/glenoid fossa in (d) and (e), the osteophyte at the anterior part of the condyle in (d) and the thickened, sclerotic appearance of the condyle in (e)