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.
Related Radiopaedia articles
Lower limb radiography
- standard foot radiograph series
- weightbearing foot radiograph series
- special foot views