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°