Water on the knee can be caused by many different types of problems, ranging from traumatic injuries to diseases and conditions.

Injuries

Damage to any part of your knee can cause the painful buildup of excess joint fluid. Examples of traumatic injuries that cause fluid buildup in and around the knee joint are:

  • Broken bones
  • Meniscus tear
  • Ligament tear
  • Overuse injuries

Diseases and conditions

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

  • Osteoarthritis
  • Rheumatoid arthritis
  • Infection
  • Gout
  • Pseudogout
  • Bursitis
  • Cysts
  • Bleeding disorders
  • Tumors
Jun. 16, 2012