A constant structural inversion of the forefoot with respect to a bisection of the posterior of the calcaneus when the subtalar joint is in neutral position, as seen below in the Uncompensated view as shown.
This is an inverted position of the forefoot relative to the rearfoot at the level of the midtarsal joint. It is due to inadequate frontal plane torsion occurring during normal development of the foot. Upon weight-bearing, calcaneal eversion is required to fully compensate this deformity. Ten to fifteen percent of patients treated with biomechanical problems have forefoot varus. This disorder causes some of the most severe pronation problems and foot deformities.
Forefoot supinatus - Long term compensatory calcaneal eversion can eventually twist the forefoot into a soft tissue or positional varus position of the forefoot relative to the rearfoot. This is not an osseous abnormality. It mimics forefoot varus. It will disappear with the use of foot orthotics.
Clinical observations and symptoms:
Intractable Plantar Keratoma’s 1,2,4; callus 1 and hallux; plantar fasciitis; neuroma; hallux abducto valgus; posterior tibial tendonitis; low back pain