M90.579

Clinical Causes: Trauma or injury disrupting blood flow to the ankle or foot bones Steroid medication use, which can impair blood supply Excessive alcohol consumption, leading to compromised blood flow Blood clotting disorders that obstruct blood vessels Certain medical conditions such as sickle cell disease or autoimmune disorders Prolonged use of corticosteroids or chemotherapy Decompression sickness (the bends) in rare cases Radiation therapy resulting in blood vessel damage

Key Symptoms: Persistent pain in the affected ankle or foot, which worsens with activity Swelling and tenderness around the affected area Reduced range of motion in the ankle or foot joints Joint stiffness and difficulty bearing weight Bone collapse and deformity in advanced stages Cracking or grinding sensations during joint movement Signs of inflammation such as redness or warmth (less common)

Diagnosis Path: Medical history review focusing on risk factors and symptom onset Physical examination assessing joint pain, swelling, and range of motion X-rays to identify bone collapse or joint damage Magnetic Resonance Imaging (MRI) providing detailed images of bone marrow and early changes Bone scans or computed tomography (CT) scans to evaluate the extent of tissue death

Treatment Protocols: Medications such as pain relievers and anti-inflammatory drugs Physical therapy to improve joint strength and mobility Restricted weight-bearing activities or use of crutches to reduce stress on affected bones Core decompression surgery to relieve intraosseous pressure and promote blood flow Bone grafts or joint replacement procedures in advanced cases Lifestyle modifications including avoiding alcohol and medications that affect blood flow Addressing underlying causes like blood clotting disorders or medication side effects