Swelling After Joint Replacement: What Is Normal?

Swelling after joint replacement is a normal part of healing, especially during the first few days and weeks after surgery. Your knee, hip, ankle, or foot may look puffy, feel warm, or become more swollen after activity. Swelling usually improves gradually, although some may last for several months. Increasing swelling, worsening pain, fever, or wound drainage should be reported to your surgical team promptly.

How much swelling is normal after joint replacement?

Swelling is common after joint replacement surgery because the procedure affects the tissues around the joint. It may involve the operated area and extend into nearby parts of the limb. After knee replacement, for example, swelling can affect the knee, calf, ankle, and foot. According to the American Academy of Orthopaedic Surgeons (AAOS), moderate to severe swelling can occur during the first few days or weeks after knee replacement. Mild to moderate swelling may continue for approximately three to six months. The amount and duration of swelling depend on the joint replaced, the type of operation, your activity level, and your recovery. Swelling after hip replacement may look different from swelling after knee replacement, so your surgeon's instructions are the best guide for your particular procedure.

How long does swelling last after joint replacement?

Swelling generally decreases as the tissues heal, but recovery is gradual rather than immediate. The following timeline provides a general guide, particularly for people recovering from knee replacement.

During the first few days

Swelling around the operated joint is expected. The area may feel tight or uncomfortable, and movement may be more difficult because of the extra fluid in the tissues. Bruising can also appear around the surgical site or extend down the limb. Your healthcare team will guide you on pain relief, cold therapy, safe movement, and leg positioning. Follow the specific instructions you received before leaving the hospital.

During the first two to six weeks

Swelling may remain noticeable, particularly after walking, standing, or completing physical therapy exercises. It may improve when you rest and elevate the affected limb. Some days may be better than others. The important consideration is the overall pattern. Swelling should generally begin to settle over time, even if it does not disappear completely. If it starts increasing, becomes more painful, or is accompanied by new symptoms, contact your surgical team rather than assuming it is part of routine recovery.

During the next three to six months

Some residual swelling and stiffness can persist for several months, particularly after knee replacement. The joint may look fuller than expected even when pain and mobility are improving. The NHS guidance on knee replacement recovery explains that full recovery can take several months or longer. A gradual reduction in swelling is generally reassuring, but persistent or disruptive swelling deserves review if it is not following the recovery pattern your surgeon described.

What does normal postoperative swelling look and feel like?

People recovering from joint replacement may notice several changes around the operated limb. These experiences can occur during normal healing, although their meaning depends on the timing and the overall clinical picture.

• Puffiness around the joint: The knee or hip area may appear fuller than it did before surgery.
• Swelling extending downward: Fluid-related swelling may be noticeable around the lower leg, ankle, or foot after knee surgery.
• Mild warmth: The operated area may feel warmer than the surrounding skin during recovery.
• Bruising or skin discoloration: Bruises may develop around the incision and sometimes extend farther down the limb.
• Tightness and stiffness: Swelling can make bending the knee or moving the joint feel more difficult.
• Changes after activity: The joint may become more swollen after walking or exercises and feel better after rest and elevation.

These features do not establish that recovery is progressing normally on their own. For example, warmth may occur during healing, but increasing warmth with spreading redness, worsening pain, or wound drainage needs medical assessment.

Why does swelling increase after walking or physical therapy?

Swelling can fluctuate with activity during recovery. Walking, standing for extended periods, and rehabilitation exercises may make the operated limb look or feel more swollen, especially in the early stages. This does not necessarily mean that the artificial joint has been damaged. However, it is important to balance activity with rest rather than pushing through a substantial increase in discomfort. Follow the walking schedule and exercises prescribed by your physiotherapist. If swelling repeatedly increases enough to interfere with movement, prevents you from completing your rehabilitation, or continues to worsen, ask your care team whether your activity plan needs adjustment.

How can you reduce swelling after joint replacement?

Several measures may help manage expected postoperative swelling. Your surgeon's instructions take priority because recommendations can differ according to the joint replaced, the surgical approach, and your medical circumstances.

Elevate the operated limb

When resting, support the leg with pillows as directed by your healthcare team. After knee replacement, elevating the entire leg, including the ankle, may help reduce swelling. Avoid positioning the knee in a prolonged bent position if your postoperative instructions advise keeping it straight.

Use ice or cold therapy safely

Cold packs can help relieve swelling and discomfort. The AAOS recommends ice and elevation as part of swelling management after knee replacement. Wrap the cold pack in a thin towel rather than placing ice directly on the skin. Follow the duration and frequency recommended by your surgical team, and take particular care if you have reduced skin sensation.

Keep moving within your prescribed limits

Gentle walking and prescribed exercises support recovery and help reduce the risks associated with prolonged inactivity. Increase activity according to your rehabilitation plan instead of suddenly doing more because you feel better. If an exercise causes a substantial increase in pain or swelling, discuss this with your physiotherapist or surgeon before making major changes to your routine.

Follow your medication and compression instructions

Take prescribed medicines as directed. If your surgical team has prescribed blood-thinning medication or compression stockings, follow the instructions carefully. These measures may be part of your plan to reduce the risk of blood clots. Do not start a diuretic, change a blood thinner, or use additional compression without checking with your healthcare professional. These measures are not appropriate for every person recovering from surgery.

When is swelling after joint replacement a warning sign?

Swelling can occur during normal recovery, but some changes require prompt attention. In particular, a sudden increase in swelling or symptoms that worsen instead of gradually improving should not be dismissed.

Could swelling indicate a blood clot?

A deep vein thrombosis (DVT) is a blood clot in a deep vein, usually in the leg. The risk of developing a clot is increased after major operations, including hip and knee replacement. The NHS information on knee replacement complications identifies leg pain and swelling as possible warning signs of a blood clot. Contact your surgical team or seek urgent medical assessment if you develop new or increasing swelling, particularly when accompanied by:

• Pain or tenderness in the calf or elsewhere in the leg.
• New redness or discoloration of the skin.
• Skin that feels unusually warm over the swollen area.
• Swelling that is clearly greater in one leg than expected during recovery.

These symptoms can have different causes, and a blood clot cannot be confirmed or ruled out by appearance alone. Do not massage a leg that may have a blood clot while waiting for assessment.

Could swelling indicate an infection?

An infection around the surgical wound or artificial joint can cause increasing swelling and pain. Other possible warning signs include:

• Increasing redness or warmth around the incision.
• Fluid, pus, or other new drainage from the wound.
• Fever, chills, or feeling generally unwell.
• Pain that is increasing rather than improving.

The MedlinePlus hip replacement discharge guidance advises contacting the surgeon about increasing incision redness or pain, wound drainage, leg swelling, and calf pain. Contact your surgical team promptly if any of these changes occur. Do not wait for every symptom to appear, and do not rely on the absence of fever to rule out an infection.

When is swelling an emergency?

Call your local emergency number immediately if swelling or leg pain occurs with sudden shortness of breath, chest pain, fainting, or difficulty breathing. These symptoms can indicate a blood clot that has travelled to the lungs, a potentially life-threatening complication. Do not drive yourself to the hospital if you are experiencing these emergency symptoms.

What should you do if swelling is not improving?

Arrange a review with your surgeon if swelling persists without a clear improvement, becomes increasingly uncomfortable, limits your movement, or returns in an unusual pattern. Seek earlier assessment if symptoms worsen suddenly or you develop any warning signs described above. Your healthcare professional may consider the timing of the operation, your recovery so far, your medical history, and the findings of an examination. Depending on the circumstances, additional tests may be needed to assess for complications. Keep track of when the swelling occurs, whether it improves with rest, and whether you have noticed changes in pain, temperature, skin color, wound appearance, or mobility. These details can help your care team understand what is happening.

How can you tell whether recovery is progressing well?

The overall pattern of recovery is more useful than the appearance of the joint on a single day. Swelling may remain visible even as walking becomes easier and movement gradually improves. During follow-up appointments, your surgeon or physiotherapist can assess swelling alongside pain, wound healing, joint movement, and your ability to perform daily activities. Follow-up is especially important when progress stalls or symptoms begin to move in the wrong direction. There is no single amount of swelling that is normal for every patient. Your recovery plan should account for the type of joint replacement and your individual progress.