In clinical practice, a patient with rotundity, also known as O-leg, can be diagnosed as having internal derangement of the knee. When a patient suffers from this condition, he or she needs to be treated with corrective surgery. There is no uniform and clear price for this condition, because different correction methods are charged at different rates. For example, if a patient undergoes a closed wedge osteotomy of the upper tibia under epidural anesthesia and is fixed with an external fixation brace after surgery, the general cost is about 18,000-20,000 dollars. If a conventional incision is made for proximal tibial wedge osteotomy and intraoperative locking plate internal fixation is given, the general cost is about 25,000-28,000 yuan. In addition, the specific charges should be based on the local hospital charges. Because the region is different and the level of the hospital is different, the charges may be slightly different.