Meary's angle

Meary's angle or talus-first metatarsal angle has been used to identify the apex of deformity in patients with pes cavus and pes planus on lateral weight-bearing foot radiographs.

Measurement

It is the angle between a line drawn from the centers of longitudinal axes of the talus and the first metatarsal.

Interpretation

In the normal weight-bearing foot, the midline axis of the talus is in line with the midline axis of the first metatarsal. Normally Meary's angle is 0º, with abnormal values considered :

It can also be used to classify the severity of deformity :

  • mild <15º
  • moderate: 15-30º
  • severe: >30º