Description: Under adverse and badly treated fractures of the lateral tibial plateau there are often come across complications like those: lowering and widening of tibial plateau, limb axis and biomechanical disturbance. As a result different load secondary osteoarthritis of the knee is appearing. That lead pain and limitation of knee motions and from there - quality of life decreasing. In cases like this the only possible outcome is a monocondylar or total knee arthroplasty