Aim: To estimate underfoot pressure distribution in persons with hallux valgus deformity. Material: 48 subjects both sexes, aged 25 to 65 y with hallux valgus (hallux valgus angle 10û to 45û) and a decreased foot transversal arch. The control group consisted of 40 normal subjects. Methods: The clinical examination, radiological, static and postural pedobarographic study. The underfoot pressure was determined by pedobarography at deþned foot regions according to the classiþcation of Blomgren. Results: On comparing with the control group in patients with hallux valgus and a decreased foot transversal arch in pedobarographic examination we found: the lateral shifting of maximal pressure within third and fourth midfoot radius (MT3 and MT4 foot regions according to Blomgren), and an increased pressure in the proximal part of the hindfoot. Conclusions: The patients with hallux valgus have different pattern of underfoot pressure distribution. There is an increased load of the lateral part of foot and the proximal part of the hindfoot. These biomechanical changes may be responsible for the foot and lower limb pain.