From the case:
Hallux valgus: intermetatarsal angle
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Hallux valgus: Intermetatarsal angle
Case Discussion
The intermetatarsal (IM) angle is drawn between the 1st and 2nd metatarsal shaft on an axial view of the foot. A normal value is considered to be under 9 degrees.
This angle increases with hallux valgus and metatarsus adductus deformities