Drop-splayfoot (pes planotransversus; ICD-10 M21.67: Other acquired deformities of the ankle and foot) is one of the acquired foot deformities. Shape deformities of the feet can also be congenital (ICD-10 Q66.8: Other congenital deformities of the feet).
Mainly, flat splayfoot does not occur congenitally. Along with splayfoot, it is one of the most common acquired foot deformities.
Splayfoot occurs when the longitudinal and transverse arches are flattened (see below “Causes/pathogenesis”).
The prevalence of congenital foot deformities is 3-4% (in Germany).
Course and prognosis: A fallen splayfoot can lead to pain due to overstraining of the foot muscles as well as to knee damage, heel spurs, intervertebral disc and back problems due to the altered statics. A fallen splay foot can be treated or corrected by individually made orthopedic footwear. In more severe cases, surgery is required.If left untreated, hallux valgus (crooked toe; misalignment of the big toe), among other conditions, can develop.
