Many types of problems, ranging from traumatic injuries to diseases and other conditions, can cause a swollen knee.

Injuries

Damage to any part of your knee can cause excess joint fluid to accumulate. Injuries that can cause fluid buildup in and around the knee joint include:

  • Torn ligament, particularly the anterior cruciate ligament (ACL)
  • Cartilage (meniscus) tear
  • Irritation from overuse
  • Broken bones

Diseases and conditions

Underlying diseases and conditions that can produce fluid buildup in and around the knee joint include:

  • Osteoarthritis
  • Rheumatoid arthritis
  • Infection
  • Gout
  • Pseudogout
  • Bursitis
  • Cysts
  • Tumors
May 21, 2015

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