Fig. 4From: Reliability of different smartphones measuring the hallux valgus parameters in a new rapid method: a follow-up studyThe methods of measuring HVA and IMA. a Rotate the photo until the gridline was parallel or overlapping to the long axis of the first proximal phalanx. b Get the gridline parallel or overlapping to the long axis of the first metatarsal bone. c Rotate the photo to get gridline parallel or overlapping to the second metatarsal boneBack to article page