Angle of the longitudinal arch (foot)
The angle of the longitudinal arch is one of the angles drawn on the weightbearing lateral foot radiograph. The angle is formed between the calcaneal inclination axis and a line drawn along the inferior edge of the 5th metatarsal.
The normal angle is 150-170 degrees.
In pes cavus, as the height of the longitudinal arch increases, the calcaneal inclination angle increases. The obtuse angle between the calcaneal inclination axis and the 5th metatarsal decreases below 150 degrees.
In pes planus, the angle of the longitudinal arch increases such that the lines become parallel and the angle exceeds 170 degrees.
Lower limb radiography
- standard foot radiograph series
- weightbearing foot radiograph series
- special foot views