Knee Joint Effusion: Symptoms, Causes, Prevention

Knee joint effusion is a disorder in which extra fluid gets collected inside or around the knee joint. That fluid in a small quantity is required for joint lubrication, which is normal. But an excess amount of fluid in the knee joint can cause swelling, pain, and restricted movements. Infections, arthritis, injuries, and prolonged knee stress are the common causes. Here in this blog, we will discuss all about knee joint effusion.

What Exactly is Knee Joint Effusion?

Our knee joint is a synovial joint, which is lined with a tissue that produces synovial fluid. It provides lubrication to the joint and reduces friction. But when the fluid is produced in greater quantities than the necessary requirement, and is collected inside the knee joint. This condition is known as knee joint effusion.

Normally, it occurs due to arthritis, infection, or traumatic injury. Mostly one knee is affected, and it looks bigger than the other one.

The effusion is mostly transient, but failure to treat the underlying cause may result in chronic knee effusion. Whatever the case, Knee Effusion is said to occur in people in all age groups, but is more common among the elderly and active people.

Common Symptoms

Fluid in one knee may cause the following symptoms:

• Knee stiffness results in difficulty in bending the knees.
• Knee puffiness/swelling
• Restricted movement
• Walking, using stairs, or standing for a long time causes pain
• Warmth and redness in the case of inflammation or infection

Seek medical attention at once if you have:

• Inability to stand or bear weight
• High fever with knee swelling
• Numbness or no pulse below the knee

These signs may indicate a serious infection or nerve issue.

Common Signs and Symptoms of Foot Drop

• Difficulty lifting the front of the foot
• Dragging toes while walking
• High-stepping walk (steppage gait)
• Numbness in the top of the foot or shin
• Toes or ankle weakness
• Difficulty in standing on heels
• Pain in the lower back (if caused by a slipped disc)

These symptoms may appear slowly or unexpectedly, depending on the cause.

Causes of Knee Effusion

Your knee or other joints may swell with fluid for a number of causes. Among the most typical explanations are:

Infections: Septic arthritis is an infection of the joint. Being a seriously harmful condition, septic arthritis can also prove to be fatal to your joint. Because of this, you might have to go in for a surgery known as joint replacement. Your joint tissues may fill up with pus due to an infection. Pus is a protein-rich fluid that contains many dead white blood cells.

Inflammation: This could result from diseases including rheumatoid arthritis, gout, or arthritis, particularly osteoarthritis.

Overuse: This is the result of excessive joint usage. For example, running too frequently and too hard may cause your knee to swell.

Trauma: Examples of trauma that might cause edema include ligament damage or a bone

Fracture: Contact sports and auto accidents are two potential causes of these injuries.

Tumor: A lump of tissue that could be malignant or benign (noncancerous).

How is Knee Effusion Diagnosed?

Your doctor may perform the following tests in order to diagnose the knee effusion:

• Physical examination is done to check swelling, mobility, and pain
• Arthrocentesis is done to extract the fluid and check it for blood, germs, or crystals
• X-rays to check for damage to the bones and osteoarthritis
• MRI or ultrasound to find soft tissue injuries, such as ligament tears or synovitis.
• Blood testing to identify infections or autoimmune diseases