The aim of the study was to assess the variability of parameters characterising the gait of patients after Tibio-talo-calaneal arthrodesis. The locomotion study evaluated values of angular changes in the hip, knee and ankle joints in three planes of motion, as well as spatio-temporal parameters. The locomotion examination was carried on 4 patients aged between 45 and 60 years (55±7,6), using Vicon 250, with diagnosed secondary degenerative changes of the left ankle and subtalar joints who had undergone the Tibio-talo-calaneal arthrodesis by retrograde intramedullary nail. The control group comprised 30 healthy subjects aged 50- 70 years. Ankle and subtalar arthrodesis have changed the gait stereotype causing a reduction in the economy of patients’ locomotion, the influence of the surgery on the function of the neighbouring joints is also distinctly marked.