Causes of Knee Pain

• Arthritis (e.g., degenerative, gouty, infectious, inflammatory, traumatic)
• Baker's Cyst (popliteal cyst): This is a fluid collection in a cyst that bulges out from the knee joint. Symptoms include painful or painless swelling in the area behind the knee.
• Bursitis: Prepatellar bursitis is a fluid filled sack localized on the inferior aspect of the anterior knee.
• Cellulitis
• Overuse injury, tendonitis
• Patellofemoral pain syndrome (chondromalacia patellae)
• Trauma (e.g., contusion, dislocation, fracture, sprain, strain)