INTRODUCTION. The aim of the studies was an attempt to evaluate the variability of kinematic parameters of the lower limb joints of subjects before and after total knee replacement in the context of therapeutic rehabilitation. Angular values changes in the knee, ankle, and hip joints were studied in three planes of movement. The analysis assumed parameters, which have changed as a result of the surgical intervention. MATERIAL AND METHODS. Studies on the locomotion were carried out on 20 subjects within the age range of 48 to 74 years using Vicon 250 system for three dimensional locomotion analysis. RESULTS. The movement pattern of lower limb joints has changed after knee arthroplasty. The analysis of kinematic parameters has showed that the most prominent changes were revealed in the ankle joints in the sagittal plane, in the knee joints in the transverse and frontal planes and in the hip joints in transversal plane.