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
Related DDx ⬆