Angle of the longitudinal arch (foot)
The angle of the longitudinal arch (calcaneal–fifth metatarsal angle) is one of the angles drawn on the weight-bearing lateral foot radiograph.
The angle is formed between the calcaneal inclination axis and a line drawn along the inferior edge of the 5th metatarsal:
- pes planus: >170°
- normal: 150-170°
- pes cavus: <150°