Is Swelling Normal After Knee Replacement?
Swelling is common after knee replacement surgery. It may affect the knee, lower leg, calf, ankle and foot. Swelling develops because surgery causes a normal inflammatory and healing response in the tissues around the knee.
Swelling may also be influenced by temporary reduction in mobility, increased blood and fluid flow to the healing area, bruising, muscle weakness, the leg remaining down for long periods, increased walking or exercise, and individual circulation or medical health. The operated knee may also feel warmer than the opposite knee during recovery. Normal swelling should generally improve gradually, although it may fluctuate according to activity. For the complete recovery pathway, read Knee Replacement Recovery Timeline.
Where Can Swelling Occur?
Postoperative swelling is not always limited to the knee. Fluid may move downward because of gravity and cause swelling around the shin, calf, ankle, foot and toes. Bruising may also gradually move down the leg. This can make the ankle or foot appear more swollen several days after surgery, even when the surgical incision is healing. However, one-sided calf swelling associated with increasing pain, tenderness or redness should not automatically be assumed to be routine postoperative swelling.
How Long Does Swelling Last?
There is no fixed date by which swelling must disappear. The amount and duration vary according to total or partial replacement, one or both knees, primary or revision surgery, preoperative deformity, surgical complexity, body weight, circulation, medical conditions, activity level, pain control, physiotherapy and individual healing. Swelling is usually greatest during the early recovery period and should gradually reduce over the following weeks, although mild swelling after walking, exercise or prolonged standing may continue for several months. The important factor is the overall trend: swelling that gradually becomes less severe is more reassuring than swelling that is progressively increasing.
Why Swelling May Increase During the Day
Swelling frequently increases toward evening because the leg has remained below heart level during sitting, standing, walking, physiotherapy, household activity or travel.
Gravity allows fluid to collect in the lower leg and ankle, so the knee may feel tight, heavy, stiff, more painful and harder to bend.
This does not necessarily indicate an implant problem, but activity may need to be divided into shorter sessions with appropriate rest and elevation between them.
Swelling After Physiotherapy
A temporary increase in swelling may occur after knee-bending exercises, strengthening, stair practice, longer walks, stationary cycling or increased resistance. Some reaction is expected when activity is progressed. However, the exercise programme may need adjustment if swelling becomes markedly worse after every session, persists into the following day, causes loss of previously achieved movement, prevents safe walking, produces severe pain or interferes significantly with sleep. Physiotherapy should be progressive rather than forceful. Read Physiotherapy After Knee Replacement Surgery.
How to Reduce Swelling
Leg Elevation
The leg may be elevated so the ankle is above the level of the heart when practical. The support should generally be placed beneath the heel and lower leg rather than keeping the knee permanently bent over a pillow.
Cold Therapy
Cold application may help reduce pain, swelling and muscle soreness. A protective cloth should be placed between the cold pack and skin. Cold should not be applied directly to numb skin or for excessively prolonged periods.
Ankle Movements and Short Walks
Regular ankle pumps may support circulation and reduce prolonged pooling of fluid. Walking supports circulation and muscle activation. One prolonged walk may produce more swelling than several shorter walks spread through the day.
Activity Modification and Prescribed Medication
The patient may need to reduce prolonged standing, excessive walking, repeated stairs, heavy household work and long periods with the leg hanging down. Blood-thinning and pain medicines should be taken exactly as directed. Patients should not increase medication or add anti-inflammatory treatment without checking medical suitability.
Should the Knee Be Massaged?
Gentle soft-tissue techniques may sometimes be used by a trained physiotherapist when appropriate. Patients should avoid forceful or unapproved massage over the healing incision, areas of marked redness, a painful swollen calf, open skin, wound drainage, suspected infection or suspected blood clot. A painful swollen calf should be medically assessed rather than massaged.
Compression Stockings
Compression stockings may be recommended in selected patients to support circulation and swelling management.
They must fit correctly, avoid folding or rolling, not create excessive pressure, be removed and reapplied according to instructions and allow monitoring of the skin and circulation.
Report increasing numbness, severe tightness, toe discoloration, a cold foot, skin injury or increasing pain.
Normal Swelling Versus Possible Blood Clot
Routine postoperative swelling commonly affects the knee and lower leg, changes with activity and elevation, improves gradually and occurs without severe calf tenderness.
Possible signs of deep-vein thrombosis include new or increasing calf pain, calf tenderness, new or increasing calf, ankle or foot swelling, red or discoloured skin, swelling that does not improve with elevation or a firm and unusually tight calf.
Not every blood clot causes obvious symptoms. Medical assessment may include duplex ultrasound when a clot is suspected. Sudden breathlessness, chest pain, coughing blood or fainting may indicate pulmonary embolism and requires emergency care.
Infection and Swelling
Infection around a knee replacement may cause increasing swelling, increasing or persistent pain, redness around the incision, wound drainage, progressive stiffness, fatigue, increasing warmth and sometimes fever. Infection can be present without fever. Infection should be considered when a knee that had been improving becomes more painful, swollen, stiff, red or less functional. Evaluation may require clinical examination, blood inflammatory markers, joint-fluid aspiration, microbiology testing and imaging. Patients should not begin leftover antibiotics independently because antibiotics can interfere with infection testing.
Wound Drainage
A small amount of early staining on a dressing may occur according to closure method and protocol. Contact the treating team when there is persistent wetness of the dressing, blood repeatedly soaking through the dressing, yellow, cloudy or foul-smelling fluid, separation of the incision, increasing redness, increasing pain or swelling, or drainage after the wound had appeared dry. The wound should not be soaked in water until it has sealed and the surgical team permits it. Read Wound Care After Knee Replacement.
Bruising After Knee Replacement
Bruising may appear around the knee, thigh, calf, ankle or foot. It may become more visible several days after surgery as blood spreads through the tissues. Bruising is often more noticeable in patients taking blood-thinning medication. Prompt review is appropriate when bruising is associated with rapidly increasing swelling, severe tightness, dizziness, marked weakness, persistent wound bleeding, a significant fall, inability to bear weight or sudden deterioration.
Sudden Swelling After a Fall
A fall may cause soft-tissue injury, bleeding, wound damage, fracture around the implant or implant-related injury. Seek assessment when a fall is followed by sudden swelling, severe pain, new deformity, inability to stand, inability to bear weight, wound opening or loss of knee movement. The patient should not attempt to walk it off when weight bearing is no longer possible.
Swelling and Knee Movement
Swelling may limit knee bending and make the knee feel tight. It can also inhibit the quadriceps and contribute to weakness, difficulty lifting the leg, knee buckling, limping and difficulty with chair rise. Reducing swelling may improve both comfort and function, but complete inactivity is usually not the solution. The rehabilitation plan should balance movement, rest, elevation, strengthening, walking and pain management.
Is a Warm Knee Normal?
The operated knee may remain warmer than the opposite knee during healing because of increased blood flow and tissue activity. Warmth may be expected when it is mild, gradually improving, not associated with wound drainage, not accompanied by increasing redness and not associated with progressively worsening pain. Warmth should be reviewed when accompanied by increasing swelling, spreading redness, persistent severe pain, wound drainage, progressive stiffness or feeling unwell.
Swelling After Partial, Total and Robotic Replacement
Partial knee replacement may produce less extensive early swelling in some patients because more natural bone and soft tissue are preserved, but individual recovery still varies. Total knee replacement involves broader joint resurfacing and may produce greater early swelling. Robotic assistance may support planning and bone preparation but does not eliminate postoperative inflammation or swelling. Read Partial Knee Replacement in Mumbai, Total Knee Replacement in Mumbai and Robotic Knee Replacement in Mumbai.
When Swelling Persists for Months
Residual swelling may continue during later recovery, particularly after long walks, travel, exercise, prolonged standing or a major increase in activity. Persistent swelling should be assessed when it is not gradually improving, is associated with significant pain, accompanied by recurrent warmth or redness, limiting movement, associated with instability, present after an initially symptom-free period or developing months or years after surgery. Possible causes include infection, implant loosening, instability, wear, recurrent inflammation, venous circulation problems or another medical condition. Read Pain After Knee Replacement Surgery.
When to Contact the Treating Team
Seek prompt assessment for rapidly increasing swelling, new or increasing calf pain, swelling that does not improve with elevation, increasing redness, wound drainage, increasing pain after initial improvement, new inability to bear weight, repeated knee giving way, new weakness or numbness, or a fall followed by swelling or severe pain.
Seek emergency care for sudden breathlessness, chest pain, fainting, coughing blood or a cold, pale or blue foot.
Why Patients Consult Dr. Mayur Rabhadiya
Dr. Mayur Rabhadiya follows a structured approach to swelling after knee replacement.
His assessment emphasises distinguishing expected postoperative swelling from complications, examining the wound and surrounding skin, assessing calf tenderness and circulation, reviewing pain and activity patterns, evaluating knee movement and stability, investigating infection when indicated, arranging blood-clot assessment when necessary, adjusting rehabilitation when activity is excessive and avoiding unnecessary tests when swelling is following a normal recovery pattern.
Knee-Replacement Follow-Up in Ghatkopar, Mumbai
Diabplus Clinic, Ghatkopar East: 601, 6th Floor, Skyline Status, Mahatma Gandhi Road, opposite Pooja Hotel, Pant Nagar, Ghatkopar East, Mumbai, Maharashtra 400077. Visit Dr. Mayur Rabhadiya in Ghatkopar East.
Savla Clinic, Ghatkopar West: 2/3, Dharmodaya Building, next to Raj Medical, near NULife Hospital, Jivdaya Lane, Ghatkopar West, Mumbai, Maharashtra 400086. Visit Dr. Mayur Rabhadiya in Ghatkopar West.
Frequently Asked Questions
Is swelling normal after knee replacement?
Yes. Swelling around the knee, lower leg, ankle and foot is common during early recovery.
How long does swelling last?
It generally reduces over several weeks, although mild activity-related swelling may continue for several months.
Why is my ankle swollen after knee surgery?
Fluid can move downward because of gravity, especially while sitting, standing or walking.
What swelling may indicate a blood clot?
New calf pain, tenderness, redness or swelling that does not improve with elevation requires prompt assessment.
Can robotic surgery prevent swelling?
No. Robotic assistance does not eliminate the normal inflammatory response to surgery.
About the Author
Dr. Mayur Rabhadiya is an Orthopedic & Joint Replacement Surgeon with clinical focus in knee-replacement recovery, swelling after knee replacement, total and partial knee replacement, robotic-assisted knee replacement, blood-clot and infection warning-sign assessment, painful knee-replacement evaluation and revision knee replacement. Written and medically reviewed by Dr. Mayur Rabhadiya. Last medically reviewed: June 2026.
Clinical References
American Academy of Orthopaedic Surgeons: Total Knee Replacement
American Academy of Orthopaedic Surgeons: Deep-Vein Thrombosis
American Academy of Orthopaedic Surgeons: Infection After Joint Replacement
NHS: Recovering From Knee Replacement
Book a Knee-Replacement Follow-Up Consultation
Consultation may be useful if swelling is progressively increasing, the calf has become painful or tender, swelling does not improve with elevation, the wound is red or draining, the knee is becoming more painful or stiff, swelling has returned months after surgery, recovery appears delayed or you require postoperative guidance or a second opinion. Book an orthopedic consultation with Dr. Mayur Rabhadiya in Ghatkopar, Mumbai. Call or WhatsApp: +91 84249 03913 / +91 96113 30063.
Medical Disclaimer
This page provides general patient education and does not replace individual postoperative instructions or medical assessment. Swelling patterns vary according to the operation, activity, circulation, medical health and complications. Seek prompt medical advice for rapidly increasing swelling, calf pain, wound drainage, increasing redness, worsening pain or inability to bear weight. Sudden chest pain, breathlessness, fainting, coughing blood or a cold and pale foot requires emergency care.
Explore the complete Knee Replacement Guides hub for preparation, surgery, recovery and long-term outcome articles.