Skip to main content

Table 2 Definitions of the ankle morphological parameters

From: Effects of positioning on radiographic measurements of ankle morphology: a computerized tomography-based simulation study

Distal Tibia
TiAL (mm) Tibial arc length: distance between the most anterior (A) and posterior (B) points of the maximal arc of the tibial mortise in the sagittal plane
TiSR (mm) Tibial sagittal radius: radius of the AB arc
APG (mm) Anterio-posterior gap: longitudinal (Y-axis) component of the distance between A and B
APA (deg) Anterio-posterior inclination angle: inclination angle between the X-axis and the AB segment
MTiTh (mm) Maximal tibial thickness: The A/P distance from the most anterior (C) to the most posterior (D) point on the tibial profile in the sagittal plane
MDA (mm) Longitudinal (S/I) distance between A and C
MDV (mm) Longitudinal (S/I) distance between the most proximal vertex of the tibial mortise (V) and the point D
TiW (mm) Tibial width: M/L distance of the tibial mortise calculated using the two end-points of the anterior (TiWa) and posterior (TiWp) edges
MalW (mm) Malleolar width: M/L distance between the most lateral point of the fibula and the most medial point of the tibia
MLATi (deg) Angle in the frontal plane between the M/L axis and the line joining the most distal points of the fibula and tibia
Talus
TaAL (mm) Trochlea tali arc length: distance between the most anterior (F) and posterior (G) and proximal (H) points of the trochlea tali, as seen in the sagittal projection of the talus. The suffixes m, l and c indicate the corresponding medial, lateral and central arcs, respectively
TaW (mm) Trochlea tali width: width between medial and lateral crests of the talar dome. The suffix a, p and c indicates this width, respectively, in the most anterior, most posterior and central location along M/L axis, i.e., of Fm F l , G m G l and H m H l segments
TaR (mm) Trochlea tali radius: radius of the talar dome in the sagittal plane, as identified by the arc GF. The suffixes m, l and c indicate the corresponding medial, lateral and central arcs
MLATa (deg) Angle in the frontal plane between the M/L axis and the line joining the two most proximal vertices of the trochlea tali
  1. Definitions of the parameters used to describe the morphology of the ankle joint. See also Figure 3 for relevant graphical descriptions.