What is the Kernig's sign examination method?

　　In general, the Kernig's sign test is a commonly used neurological examination method. If the body develops discomfort symptoms, it is recommended to seek medical examination and treatment at a hospital in a timely manner. The specific analysis is as follows:

　　The Kernig's sign test primarily helps determine whether a patient has neurological diseases such as meningitis or subarachnoid hemorrhage. During the examination, the patient needs to remain in a supine position. The doctor will flex one of the patient's hip and knee joints to a right angle, meaning the thigh and lower leg form a 90° angle. Then, the doctor holds the patient's calf with hand and slowly lifts the calf upward, gradually extending the knee joint while observing the patient's response.

　　If during the extension of the knee joint, the patient experiences resistance or feels pain, accompanied by tension and contraction of the posterior thigh muscles, Kernig's sign is considered positive. This is due to meningeal irritation causing stimulation of the spinal nerve roots, which leads to protective muscle spasms and pain when the knee joint is extended.

　　In daily clinical practice, for patients with existing low back conditions, hip joint diseases, or lower limb muscle strains, the Kernig's sign examination results might be confounded. In such cases, comprehensive evaluation combining the patient's medical history and other diagnostic tests is necessary.