Necessary tests are also done first to rule out pain due to femoral head lesions. Tests such as triphasic bone scan imaging and laser Doppler flowmetry to determine the temperature conductivity of skin blood flow. The presence of concomitant nerve injury should be determined by physical and neurological examination and electromyography. It refers to a clinical syndrome characterized by severe intractable and variable pain, malnutrition and dysfunction secondary to accidental injury, medically induced injury or systemic disease. Diagnostic criteria: a long or recent history of injury or disease; persistent burning pain, nociceptive hypersensitivity; vascular and sweating dysfunction, muscle atrophy, skin thinning, nail thickening, sensitivity to cold stimuli. Positive diagnostic sympathetic block test. CRPS treatment: Once diagnosed, treat as early as possible. This includes analgesia and rehabilitation. Nerve block (sympathetic block) as well as pharmacological (tricyclic antidepressants, antispasmodics, antiarrhythmic drugs, surface medications, opioids, etc.) treatment, etc.