Hallux Valgus Interphalangeus [Causes, Symptoms & Best Treatment] Hallux valgus interphalangeus is defined as a deformity between the long axis of distal phalanx and proximal phalanx over 10 °. This is a bunion! Hallux Valgus Interphalangeus Overview: If the first metatarsophalangeal joint(1st MPJ) is arthritic or mal-aligned in anyway, then it is possible to have … Read more