M02.169

Clinical Causes: Bacterial infections such as Shigella, Salmonella, Campylobacter, or Yersinia that cause dysentery An abnormal immune response triggered by a previous gastrointestinal infection Genetic predisposition, particularly HLA-B27 positivity, which increases susceptibility Environmental factors and exposures that increase risk of infection

Key Symptoms: Swelling and tenderness in the affected knee Pain that worsens with movement or activity Reduced range of motion in the knee joint Persistent stiffness in the joint, especially after periods of inactivity Possible redness and warmth over the affected area General signs of inflammation such as mild fever or fatigue

Diagnosis Path: Diagnosing postdysenteric arthropathy involves a combination of medical history review and physical examination. Healthcare providers often look for recent gastrointestinal infections, especially dysentery, prior to joint symptoms. Additional diagnostic steps may include: - Blood tests to detect inflammation markers and exclude other causes - Serological tests for specific bacterial pathogens - Imaging studies such as X-rays to assess joint condition - Synovial fluid analysis if joint aspiration is performed - Testing for HLA-B27 to evaluate genetic susceptibility While no single test confirms the diagnosis, combining these findings helps establish the presence of reactive arthritis affecting the knee.

Treatment Protocols: Managing postdysenteric arthropathy typically involves addressing symptoms and reducing inflammation. Common approaches may include: - Nonsteroidal anti-inflammatory drugs (NSAIDs) to relieve pain and decrease swelling - Physical therapy to preserve joint mobility and strengthen surrounding muscles - Rest and activity modification to minimize joint strain - Corticosteroid injections in cases of severe inflammation - Antibiotics are generally not effective once the triggering infection has been cleared, but may be used if persistent bacterial infection is suspected. In some cases, healthcare providers may recommend disease-modifying agents if symptoms persist or become chronic. Monitoring and follow-up are important to optimize recovery and prevent joint damage.