**3. Gait analysis in patients with gonarthrosis before and after total knee arthroplasty based on own research**

The literature on the subject (Baliunas et al. 2002, Manetta et al. 2002. Fantozzi et al. 2003, Wu et al. 2007) provides a broad description of the work of the knee joint before and after knee replacement, but these studies are mostly limited to the presentation of the joint movement in the saggital plane, without considering the other planes or the influence of the disease on the ankle and hip joints and the side which was not operated on. Therefore, research was undertaken to assess the change in kinematic parameters of the gait of persons with degenerative knee joint changes before and after arthroplasty of the joint, to present the three planes of the operated and unoperated knee – in search of compensation mechanisms and to devise a biokinematic chain of the lower limb before and after the surgical procedure.
