Measured morphometric parameters of the ankle joint
| (A) Lateral view (sagittal projection) parameters | ||
| 1 | Tibial arc length (TiAL) (mm) | Distance between the most anterior (A) and the most posterior (B) points of the arc of the tibial mortise |
| 2 | Sagittal radius of the tibial mortise (SRTi) (mm) | Radius of the circle fitting the tibial mortise profile |
| 3 | Antero-posterior gap (APG) (mm) | Distance between the points (A) and (B) along the longitudinal axis of the tibia |
| 4 | Antero-posterior inclination angle of the tibial mortise (APA) (degrees) | Inclination angle between the A-B connecting line and the tibial antero-posterior axis |
| 5 | Maximal tibial thickness (MTiTh) (mm) | Distance between the most tibial anterior point (C) and the corresponding posterior point (D) |
| 6 | Distance of level of MTiTh from the anterior limit of the mortise (MDA) (mm) | Longitudinal distance between (A) and (C) points along the tibia |
| 7 | Distance of level of MTiTh from the vertex of the mortise (MDV) (mm) | Longitudinal distance between the vertex of tibial mortise (V1) and the point (C) |
| 8 | Trochlea tali length (TaAL) (mm) | Length of the line connecting the most anterior (E) and the most posterior (F) points of the trochlea tali sagittal arc |
| 9 | Sagittal radius of the trochlea tali arc (SRTa) (mm) | Radius of the circle fitting the trochlea tali arc points |
| 10 | Talus height (TaH) (mm) | Length of the longitudinal line connecting the vertex of trochlea tali (V2) and the line connecting the most anterior (E) and the most posterior (F) points of the trochlea tali sagittal arc |
| 11 | Sagittal distance between tibial and talar vertices (SDTaTi) (mm) | Distance between the vertex of the tibial mortise (V1) and trochlea tali vertex (V2) |
| (B) Anteroposterior view (frontal projection) parameters | ||
| 1 | Tibial width (TiW) (mm) | Length of the internal line fitting between the two malleoli (between the G and H points) |
| 2 | Malleolar width (MalW) (mm) | Length of the line connecting the most medial point of the medial malleolus (K) and the most lateral point of the lateral malleolus (J) |
| 3 | Tarsal width (TaW) (mm) | Length of the line along the top of talar articular surface extending between the most medial (M) and the most lateral points (L) of the talar articular profile |
| 1 | Tibial arc length (TiAL) (mm) | Distance between the most anterior (A) and the most posterior (B) points of the arc of the tibial mortise |
| 2 | Sagittal radius of the tibial mortise (SRTi) (mm) | Radius of the circle fitting the tibial mortise profile |
| 3 | Antero-posterior gap (APG) (mm) | Distance between the points (A) and (B) along the longitudinal axis of the tibia |
| 4 | Antero-posterior inclination angle of the tibial mortise (APA) (degrees) | Inclination angle between the A-B connecting line and the tibial antero-posterior axis |
| 5 | Maximal tibial thickness (MTiTh) (mm) | Distance between the most tibial anterior point (C) and the corresponding posterior point (D) |
| 6 | Distance of level of MTiTh from the anterior limit of the mortise (MDA) (mm) | Longitudinal distance between (A) and (C) points along the tibia |
| 7 | Distance of level of MTiTh from the vertex of the mortise (MDV) (mm) | Longitudinal distance between the vertex of tibial mortise (V1) and the point (C) |
| 8 | Trochlea tali length (TaAL) (mm) | Length of the line connecting the most anterior (E) and the most posterior (F) points of the trochlea tali sagittal arc |
| 9 | Sagittal radius of the trochlea tali arc (SRTa) (mm) | Radius of the circle fitting the trochlea tali arc points |
| 10 | Talus height (TaH) (mm) | Length of the longitudinal line connecting the vertex of trochlea tali (V2) and the line connecting the most anterior (E) and the most posterior (F) points of the trochlea tali sagittal arc |
| 11 | Sagittal distance between tibial and talar vertices (SDTaTi) (mm) | Distance between the vertex of the tibial mortise (V1) and trochlea tali vertex (V2) |
| 1 | Tibial width (TiW) (mm) | Length of the internal line fitting between the two malleoli (between the G and H points) |
| 2 | Malleolar width (MalW) (mm) | Length of the line connecting the most medial point of the medial malleolus (K) and the most lateral point of the lateral malleolus (J) |
| 3 | Tarsal width (TaW) (mm) | Length of the line along the top of talar articular surface extending between the most medial (M) and the most lateral points (L) of the talar articular profile |
Source(s): Table by authors
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