Several biomechanical parameters of standing and walking in 50 patients with osteoarthrosis after total knee arthroplasty were evaluated. The patients were randomly divided in two equal groups: in the first group the surgery was performed with computer navigation system and in the second - with traditional instruments. After TKA with computer navigation centers of common body pressure and legs pressure during standing phase improved significantly better than in traditional group. Walking parameters like step length, ground contact time and rhythm coefficient improved in both groups of patients but without significant difference. Thereby more precise orientation of implant that achieved during computer assisted TKA leads to better functional performance at 6 and 12 month after surgery.

During 83 revision TKA we found out the need of bone defect compensation in 93,3% of cases. The autologic bone was used in 12 (7,5%) patients, spongeous allograft in 45 (28,1%), femoral head allograft in 10 (6,3%), structural allograft in 22 (13,8%), femoral or tibial sleeves in 17 (10,6%) and femoral or tibial augmentation blocks in 50 (31,3%). Middle-term results of revision TKA (27 months in average) were evaluated in 57 (68,7%) patients using KSS and WOMAC scores. Positive results were achieved in 48 (84,2%) patients. In 9 (10,8%) cases deep infection developed in different periods of time after surgery. Hence during revision TKA the surgeon should be ready to use different methods of bone defect compensation.

The authors overviewed particular features of TKA in patients with valgus deformity. The questions of epidemiology, distinctive bone and soft tissues abnormalities, optimal surgical approaches and deformity correction methods, as well as treatment results and complications were discussed. Authors came to the conclusion of lacking commonly accepted and reliable algorithm that would help the surgeons to deal with valgus knee in TKA.

The authors analyzed the results of different surgical approaches during 144 revision TKA. The need in extension of standard approach appeared in 24 (22,2%) patients: Coonse-Adams in 9 (8,3%), tibial tuberosity osteotomy in 6 (5,6%), quadriceps snip in 4 (3,7%) and combination of two lateral approaches to the distal femur and the knee in 5 (4,6%) patients with distal femur fracture for simultaneous osteosynthesis and implant revision. During revision TKA method of choice is the standard approach to the knee. Extensive approaches allow better visualization during surgery but may compromise knee function.