Causes of Knee Effusions - Differential Diagnosis

Causes of Knee Effusions - Differential Diagnosis

 • Infection (Septic Arthritis): Staphylococcal (40%), Streptococci (28%), Gm- bacilli (19%), Mycobacterium (8%), Gm- cocci (3%), Gram + bacilli (1%), Anaerobes (1 %)

 • Trauma: Ligamentous injuries, Meniscal injury, Intra-articulation fracture, Patellar dislocation

 • Malignancy: Hematologic, Leukemia

 • Solid tumors: Ewing's sarcoma, Giant cell tumor, Osteosarcoma, Eosinophils granuloma, Synovial sarcoma, Chondrobalstoma

 • Benign Tumor: Aneurysmal bone cyst, Osterochondroma

 • Hematologic: Hemarthrosis, Hemophilia, Synovioma, Oral anticoagulant therapy, Sickle Cell disease

 • Inflammation: Gout, Pseudo gout, Osteoarthritis, Overuse syndrome

 • Spondyloarthritis: Reactive arthritis, Inflammatory bowel disease, Rheumatoid arthritis, Juvenile RA/ldiopathic arthritis, SLE, Behcet Disease

 • Post-Infectious: Seronegative Reactive Syndrome, Acute rheumatic fever, Poststreptoccal reactive arthritis

Dr. Ravi Singh @rav7ks

#Knee #Effusions #causes #differential #diagnosis #microbiology #msk
Contributed by

Dr. Ravi Singh K
Academic Hospitalist and APD @SinaiBmoreIMRes, Clinical reasoning,Simulation and POCUS enthusiast -

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