G90.50

Clinical Causes: Trauma or injury to a limb, such as fractures, sprains, or surgery Nerve damage or irritation following physical injury Disruptions in the nervous system's regulation of blood flow and pain signals Infections or vascular conditions that impact nerve function Unknown factors where no clear injury has been identified (idiopathic cases)

Key Symptoms: Severe and persistent pain that out of proportion with the initial injury Swelling and stiffness in affected limbs Skin discoloration—redness, bluish or mottled appearance Temperature changes—warm or cold sensations in the affected area Abnormal sweating and changes in hair or nail growth Sensory disturbances such as burning, tingling, or numbness Muscle weakness, tremors, or limited mobility Skin appears shiny and stretched

Diagnosis Path: Detailed patient history to identify recent injuries or surgeries Physical examination observing skin changes, swelling, and temperature differences Imaging studies such as X-rays, MRI, or bone scans to detect changes in bone density or blood flow Thermography or other specialized tests to analyze temperature variations Nerve conduction studies to assess nerve function Other tests to exclude alternative causes of symptoms

Treatment Protocols: Medications such as pain relievers, corticosteroids, and nerve blocks Physical therapy to maintain movement and prevent joint stiffness Psychological support, including counseling or cognitive-behavioral therapy Desensitization techniques to reduce pain sensitivity Interventional procedures like nerve stimulation or sympathetic blocks Complementary therapies such as acupuncture or mirror therapy Patient education to manage expectations and improve coping strategies