Fig. 3

Coronal measurement items

1.Intra-articular space (IS); 2. Middle joint space (MS); 3. Extra-articular space (ES). Note: The width of the condyle was divided into six equal parts. The shortest distance from the point where the vertical line intersected with the condyle to the articular fossa at the first medial part is IS. The shortest distance from the point where the vertical line intersected with the condyle to the articular fossa at the midpoint part is MS. The shortest distance from the point where the vertical line intersected with the condyle to the articular fossa at the last medial part is ES