Functional exercise after femoral comminuted fracture can be performed normally after the surgical anesthesia has lapsed. First of all, static exercises of quadriceps muscles should be done, and flexion and extension exercises of hip and knee joints can be left out for the time being. However, static exercises of muscle contraction and diastole must be done to promote deep vein reflux and prevent the formation of deep vein thrombosis. If the internal fixation is relatively secure, especially after surgery with intramedullary nail, you can walk with partial weight bearing and complete functional exercises of hip in flexion and extension in about three days after surgery, while exercises of knee and ankle can also be continued. However, if a plate is used for internal fixation, it is not possible to do partial weight-bearing functional exercises at an early stage, and it is usually possible to do partial weight-bearing functional exercises in bed only 3 months after surgery.