Analysis of Criteria for MRI Diagnosis of TMJ Disc Displacement and Arthralgia
Figure 2
Protocols for diagnosis of anterior disc displacement. Angular measurement of disc position using the standard protocol (a) and the alternative protocol (b). In the standard protocol (on (a)), the posterior band of the disc is compared to the 12 o’clock position through the head of the condyle. In the alternative protocol (on (b)), the posterior band of the disc is compared to a line perpendicular to the tangent of the slope of the posterior eminence. The tangent used to represent the slope of the articular eminence was drawn superiorly between the 12 o’clock position at the most posterior part of the glenoid fossa of the temporal bone and anteriorly at the most inferior posterior point at the base of the articular eminence based on diagrams from [15].
