Causes of the swelling can include arthritis, injury to the ligaments of the<unk> , or an accident after which the body's natural reaction is to surround the<unk>  with a protective fluid. There could also be an underlying disease or condition. The type of fluid that accumulates around the<unk>  depends on the underlying disease, condition or type of traumatic injury that caused the excess fluid. The swelling can, in most cases, be easily cured. Underlying diseases may include *<unk>  osteoarthritis * Rheumatoid arthritis * Infection * Gout * Pseudogout * Prepatellar bursitis <unk> cap bursitis) * Cysts * Tumours * Repetitive strain injury Having osteoarthritis or engaging in high-risk sports that involve rapid cut-and-run movements of the<unk>  — football or tennis, for example — means an individual is more likely to develop water on the<unk> . In overweight or obese individuals the body places more weight on the<unk>  joint. This causes more wear in the joint. Over time, the body may produce excess joint fluid.
Knee effusion
Knee pain
Round ligament pain
Joint effusion
Facet joint injection
Knee arthritis
Back pain
Ankle flare