Meary's angle or lateral talo-first metatarsal angle has been used to identify the apex of deformity in patients with pes cavus and pes planus on lateral weightbearing foot radiographs. It is the angle between a line drawn from the centres of longitudinal axes of the talus and the first metatarsal.
In the normal weightbearing 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 ref required:
It can also be used to assess the severity of the deformity ref required:
- mild <15º
- moderate: 15-30º
- severe: 30º
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