A ruptured posterior cruciate ligament is reconstructed when the identified knee instability significantly impedes daily functioning or makes it impossible to take up physical activity. A factor that should be taken into account is a disturbance in the biomechanics of the lower limb secondary to PCL rupture, which translates into a significant increase in overload and thus acceleration of degenerative changes in the knee. People under 40, active or physically working people benefit most from PCL reconstruction surgery. In the case of a sedentary lifestyle, old age and mild symptoms, systematic rehabilitation is a sufficient method of treatment.