Table 1 Definitions of the measurement indices
Measurement index | Abbreviation | Definition |
|---|---|---|
Sagittal direction | ||
 Anterior joint space | AJS | The shortest distance between the most anterior point of the condyle and the posterior point of the joint nodule |
 Superior joint space | SJS | The shortest distance between the highest point of the condyle and the highest point of the fossa |
 Posterior joint space | PJS | The shortest distance between the last point of the condyle and the posterior wall of the fossa |
 Width of the glenoid fossa | WGF | The linear distance between the lowest point of the articular tubercle and the lowest point of the posterior articular process |
 Depth of the glenoid fossa | DGF | The vertical line from the highest point of the glenoid fossa to the lowest point of the articular tubercle and the lowest point of the posterior articular process |
 Sagittal condylar angle | SCA | The angle of intersection between the Frankfort plane and the tangential line to the posterior outline of the mandibular ramus |
 Height of the condyle | HC | The vertical line from the apex of the condyle to the lowest point of the articular tubercle and the lowest point of the posterior articular process |
 Length of mandibular rami | LMR | The linear distance between the condylar top and ante gonial notch |
 Length of the mandibular body | LMB | The linear distance between the gonion and gnathion |
 Width of the mandibular rami | WMR | The linear distance between the anterior and posterior branches of the mandibular branch |
 Mandibular length | ML | The linear distance between the condylar top and the gnathion |
Coronal direction | ||
 Medial joint space | MJS | The linear distance from the innermost point of the condyle to the glenoid fossa innermost point of the fovea |
 Lateral joint space | LJS | The linear distance from the outermost point of the condyle to the glenoid fossa outermost point of the fovea |
Horizontal direction | ||
 The horizontal condylar angle | HCA | The angle between the condylar long axis (the line between the most medial and lateral points) and the line "tip of the nose, septum of the nose, foramen magnum" |
 Internal and external diameters of the condyle | IEDC | The linear distance between the most lateral and medial points of the condyle |
 Anterior and posterior diameters of the condyle | APDC | The linear distance between the anterior and posterior points of the condyle |
Volume of the condyle | VC | In the sagittal direction, a vertical line perpendicular to the mandibular ramus was made through the lowest point of the sigmoid notch of the mandible to segment the condyle, and the volume of the condyle was measured by MIMICS |
Surface area of the condyle | SC | The surface area of the condyle was measured by MIMICS using the method described above |