Dense nodular shadow can be seen in the medullary cavity at the level of left femoral trochanter, and its common causes include calcification foci, osteophytes, femoral head necrosis, etc. The treatment includes general treatment, medication and surgery. 1. Calcified foci: Generally, no special treatment is needed, and regular review is enough. 2. Osteomalacia: pay attention to rest, appropriate exercise, choose to reduce the load on the knee joint sports such as walking, swimming, etc.; oral non-steroidal drugs such as ibuprofen, celecoxib, etc.; such as bone spurs compression of the nerves, blood vessels, etc., can be surgical treatment. 3. Femoral head necrosis: early use of anticoagulants such as low molecular heparin, inhibit bone-breaking and increase osteogenesis drugs, such as phosphate preparations, etc. If the necrosis process is faster, surgery can be carried out. If the necrosis process is more advanced, surgery can be carried out. There may be other reasons such as bone tumor and hemangioma, etc., which may cause dense nodular shadow in the medullary cavity at the level of the left femoral trochanter, it is recommended to go to the hospital in time, and carry out standardized treatment under the guidance of the doctor, and the above medicines should not be taken by oneself.