The aim of our study was to estimate underfoot pressure distribution of a patient with unilateral ankylosis of talonavicular joint during rheumatoid arthritis. The pedobarographic examination during bipedal standing revealed localisation of maximal pressure at the H region on the side opposite of ankylosis and increased underfoot pressure on the T region and decreased on GT, MT1-MT3 and H foot regions on the pathology side. After the end of orthopaedic treatment underfoot, pressure distribution changes persist in spite of pain regression.