Knee pain

DDx

• Patellofemoral syndrome
• Iliotibial band syndrome
• Patellar tendinitis
• Anserine bursitis
• Meniscus tear (medial > lateral)
• Medial or lateral collateral ligament strain or tear
• Cruciate ligament tear (anterior > posterior)
• Prepatellar bursitis
• Baker’s (popliteal) cyst
• Septic joint, eg, gonococcal
• Arthritis, eg, osteoarthritis, rheumatoid arthritis, gout, pseudogout, septic arthritis, reactive arthritis (Reiter’s syndrome)
• Medial plica syndrome
• Osgood-Schlatter disease
• Osteochondritis dissecans
• Neuropathic arthropathy (Charcot joint)
• Tumor, eg, osteosarcoma
• Referred pain from hip, eg, avascular necrosis
• Referred pain from back, eg, sciatica
• Fracture