M86.0

Clinical Causes: Bacterial spread through the bloodstream from a distant infection focus Staphylococcus aureus is the most common causative bacteria Other bacteria such as Streptococcus species, Escherichia coli, and Pseudomonas aeruginosa Open fractures or penetrating injuries that introduce bacteria directly into the bone Immune system deficiencies increasing susceptibility

Key Symptoms: Severe localized bone pain and tenderness Swelling and warmth over the affected area Fever and chills Lethargy or general malaise Reduced movement or pain during movement of the affected limb Elevated inflammatory markers in blood tests

Diagnosis Path: Diagnosis involves a combination of clinical assessment and diagnostic tests. Physicians typically perform blood tests to detect markers of infection such as increased white blood cell count and elevated C-reactive protein (CRP). Imaging studies like X-rays may initially appear normal but can show bone destruction or periosteal reaction in later stages. Magnetic resonance imaging (MRI) is highly sensitive for early detection. Bone aspiration and blood cultures are often performed to identify the causative bacteria, which guides targeted antibiotic therapy.

Treatment Protocols: Treatment primarily involves prompt and aggressive antibiotic therapy, often administered intravenously initially. The choice of antibiotics depends on the suspected or identified bacteria. In some cases, surgical intervention may be necessary to drain abscesses or remove necrotic bone tissue. Supportive care includes pain management and immobilization of the affected limb to reduce movement and facilitate healing. Prolonged course of antibiotics—often several weeks—is essential for complete resolution. Follow-up imaging and blood tests are used to monitor treatment effectiveness and detect potential chronic complications.