An
acquired triplane deformity of the first metatarsophalangeal joint
in which the Hallux is abducted in the transverse plane, dorsiflexed
in the sagittal plane and everted in the frontal plane. There will
be varying amounts of abduction and valgus of the hallux, medial
exostosis, the central toes may be clawed and abducted, there will
be lesions under the second metatarsal head, medial side of the
hallux IPJ, the dorsal surface of the second and fifth digits and
there will be marked osteoarthritic symptoms.
HAV
- Stage 1 :
This
stage is characterised by lateral displacement of the proximal phalanx
relative to the first metatarsal.
