The talar declination angle is drawn on the weightbearing lateral foot radiograph between the mid-talar axis and the supporting surface. It should usually measure approximately 21°.
If the first metatarsal axis is steep, the mid-talar axis approaches the horizontal and is projected above the first metatarsal. This indicates that the longitudinal arch is relatively high and there is pes cavus.
Lower limb radiography
- standard foot radiograph series
- weightbearing foot radiograph series
- special foot views