Although CT is one of the main tools to diagnose and treat low back pain, it can be easily misdiagnosed. The misdiagnosis of femoral head necrosis is mostly caused by CT. Femoral head necrosis mostly occurs in people aged 30 to 60 years old, and the common symptoms are hip and knee discomfort, pain, and limping. In general, the lumbar intervertebral disc starts to degenerate gradually from the age of 18. Most of the older patients with femoral head necrosis will find herniated lumbar discs during CT, but if the herniated lumbar discs do not compress the nerves, no symptoms such as back pain will occur, so a herniated lumbar disc itself is not necessarily a lumbar disc herniation. General X-rays and CT examinations cannot detect femoral head necrosis, but it is easy to find the problem of lumbar disc herniation. Therefore, symptoms such as back and leg discomfort, pain and claudication caused by femoral head necrosis are often mistaken for lumbar disc herniation, resulting in misdiagnosis and mistreatment. In addition, ankylosing spondylitis, lumbar spinal stenosis, knee osteoarthritis and osteonecrosis of the femoral head have similar symptoms. The similar symptoms and misleading imaging make it easy for inexperienced doctors to misdiagnose femoral head necrosis as lumbar disc herniation or other diseases. People with chronic heavy alcohol abuse, long-term improper use of hormones, femoral neck fractures, hip dislocations, and severe fractures of the lower extremities should pay special attention to the health of the femoral head. As long-term alcoholics have reduced sensitivity to pain, by the time they feel discomfort and pain in their hips, femoral head necrosis is already in the middle to late stage. Therefore, long-term alcoholics should stop drinking as soon as possible and visit the bone and joint clinic to rule out femoral head necrosis. When you have symptoms such as back and leg pain, especially hip pain and medial knee pain, you should get a physical examination from an osteoarthritic doctor, and if you suspect femoral head necrosis, you should get an MRI to characterize the disease. When doing X-ray examination, not only should we take an orthopantomogram to see the situation of the femoral head inside and outside, but also do a froggy film to see the situation of the femoral head in front and behind, so that it is not easy to misdiagnose.