A total knee replacement (also known as knee arthroplasty) is a common surgical procedure for people with severe osteoarthritis. The goal is to remove the degenerated bone to help improve mobility, reduce pain and restore function. During the surgery, damaged bone and cartilage are removed and replaced with artificial components. Sometimes a half-knee is put in, or sometimes the whole knee is replaced. This procedure is often recommended for individuals with severe osteoarthritis or other debilitating knee conditions that do not respond to conservative treatments. While knee replacement surgery can significantly improve quality of life, it is not without potential complications, one of which includes fluid on the knee after knee replacement.
Common Post-Surgery Complications
Post-surgery complications can vary in severity and may include infection, blood clots, implant issues, and joint stiffness. If you are unsure, or are in excessive pain, speak to the surgeon or hospital. However, bear in mind, you are going to have a swollen knee after surgery. It’s normal.
Causes of Fluid on the Knee After Knee Replacement
Surgical Trauma
Surgery is a common cause of fluid buildup after knee replacement surgery. The invasive nature of the procedure can cause bleeding and trauma, leading to an increase in synovial fluid production or blood production. This response is often not-so-natural, and the levels of fluid built up can be excessive and very uncomfortable. We’ve seen many hundreds of patients over the years with excessive swelling post-op. This is not uncommon, and we provide a good strategy to mitigate it.
Infections
Infections are a very serious (and fortunately not very common) concern following knee replacement surgery. Bacterial invasion of the surgical site can lead to an inflammatory response, causing fluid to accumulate in the knee joint. Symptoms of infection include increased redness, warmth, swelling, and fever. Prompt medical intervention is necessary to prevent the spread of infection and ensure the proper functioning of the knee replacement. Get urgent medical attention if you have symptoms as described above.
Prosthetic Issues
Fortunately, not too common, prosthetic issues can contribute to fluid on the knee after knee replacement surgery. Problems with the alignment, fit, or stability of the prosthetic components can cause irritation and inflammation within the knee joint. This irritation can trigger the production of excess fluid as the body attempts to manage the abnormal stress on the joint.
Blood Clots
Blood clots, or deep vein thrombosis (DVT), are a potential complication after knee replacement surgery. Clots can obstruct blood flow and lead to swelling and fluid accumulation in the knee. Symptoms of DVT include pain, swelling, and tenderness in the leg, which requires immediate medical attention to prevent serious complications.
When to Seek Medical Attention
Infection
Seek immediate medical attention if you experience signs of infection, such as high fever, increased pain, and pus drainage from the surgical site. Early intervention is crucial to prevent complications.
Persistent or Worsening Symptoms
If there are symptoms which persist or worsen despite treatment, it is important to consult with your healthcare provider. Ongoing issues may require further evaluation and intervention to manage fluid buildup and other complications.
Quality of Life Impact
If fluid accumulation impacts your quality of life and daily activities to a significant degree, seeking medical advice is essential. Effective management and treatment can help restore function and improve overall well-being.
Treatment Options
Conservative Treatments
Rest and Elevation
Elevating the affected leg and resting as much as possible can help reduce swelling and fluid accumulation. Keeping the knee elevated above heart level allows gravity to assist in reducing fluid buildup. Just put your leg on a stool if you watch TV.
Ice Therapy
Applying ice to the knee can help reduce inflammation and numb pain. Ice therapy should be used in intervals of 10 minutes, 2-3x per day, to effectively manage swelling. We rent Game Ready ice machines to patients following total knee replacements and other surgical procedures.
Compression
Using compression bandages or knee sleeves can help with swelling by preventing excessive fluid accumulation in the knee. Compression aids in reducing inflammation and providing support to the joint. Game Ready machines also offer compression to the joint.
Medications
Medications such as nonsteroidal anti-inflammatory drugs (NSAIDs) will be prescribed following surgery. They are usually prescribed for two weeks, although I often suggest patients take the medication for a minimum of four weeks. They can help reduce the excessive swelling and pain. In some cases, corticosteroid injections may be prescribed to manage severe inflammation.
Medical Interventions
Aspiration of Fluid
Aspiration, or joint fluid drainage, involves the removal of excess fluid from the knee using a needle. This procedure can provide immediate relief from pain and swelling and allows for analysis of the fluid to check for infection or other issues. We perform this regularly, and I do a lot of them. If there’s fluid in your knee, I’ll probably get it out.
Antibiotics for Infection
If an infection is present, antibiotics are necessary to eliminate the bacteria causing the infection.
Revision Surgery
In cases where conservative treatments and medical interventions are unsuccessful, revision surgery may be required. This involves replacing or repairing the prosthetic components to resolve issues causing fluid buildup and ensure the proper functioning of the knee joint.
Final Thoughts on Fluid on the Knee After Knee Replacement
Fluid on the knee after knee replacement is not just common, it’s always there after a TKR. Of course, following this level of trauma, you’d expect the knee to be swollen and stiff. Ensure you get to the rehab physio as soon as possible to start therapy.
We prefer not to aspirate the knee post-surgery for around 2-3 months, but it can be done earlier. However, you need to be aware there is an increased risk of infection. If the knee is chronically swollen, aspiration may be best option. If you’ve recently had knee surgery and have excessive swelling, please email us so we can discuss this with you further.