Fig. 1

Image volume orientation models. Coronal (a, d), sagittal (b, e) and axial (c, f) view of the TMJ. a–c Condyle-corrected. In an axial view through the centre of the condyle, the sagittal plane is aligned perpendicular to the long axis (mesiolateral diameter) of the condyle. d–f Ramus-corrected. The sagittal plane is aligned from the coronoid process through the centre of the condyle in the axial view, and approximated to the longitudinal axis of the ramus in the coronal view. Arrowheads in a and b indicate the ‘equator’ in the variable ‘reduced condylar volume’