The signs and symptoms of femoral head necrosis are diverse, and the time of appearance of the disease and the degree of its onset vary, but they are all based on the evolution of the pathology. In other words, it is difficult to make a diagnosis of osteonecrosis through the patient’s subjective symptoms and clinical examination. For example, many lesions of the hip and sacroiliac joint can be manifested by a positive “4” test (i.e., bending the knee and making the hip joint flex and abduct and externally rotate, placing it in the shape of a “4” on the contralateral straightened lower limb, pressing the contralateral iliac crest with one hand, and placing the other hand on the medial side of the knee and pressing down at the same time). The other hand is placed on the medial side of the knee and the other hand is pressed down at the same time, causing hip and hip pain). The most common symptom is pain, which is located in the hip joint, proximal thigh, and may radiate to the knee. The pain can be caused by inflammatory lesions of necrotic tissue-repair or high pressure within the inflammatory lesion and can manifest as constant pain, resting pain. Osteochondral collapse deformation leading to traumatic arthritis, or there is chronic injurious pain in the area of muscle-ligament attachment around the hip joint. Restriction of hip movement, especially rotational movement, or painful and short limp.