Managing Swelling After Knee or Hip Replacement Surgery
Swelling after a knee or hip replacement is one of the most common — and most worrying-looking — parts of recovery. For most people it's a normal response to surgery rather than a sign something has gone wrong, but knowing what's expected and what's not makes a real difference to how confident you feel during recovery.
Why Swelling Happens After Joint Replacement Surgery
Swelling after joint replacement is the body's normal inflammatory response to surgical trauma, combined with the effects of reduced mobility on circulation. It's typically most noticeable in the operated joint itself, but it's common for swelling to extend down into the lower leg, ankle, and foot too — particularly after knee replacement, where gravity pulls fluid downward when you're upright.
Some degree of swelling is expected for weeks, and it's genuinely normal for mild residual swelling to persist for several months as tissues fully heal.
What Helps Manage Swelling Day to Day
A physiotherapist will tailor this to your specific recovery, but general approaches that commonly help include:
- Elevation: Raising the leg above heart level when resting — not just propped on a low stool — encourages fluid to drain back toward the body.
- Ice, used appropriately: Cold therapy in the early weeks can help manage both swelling and pain, typically for short periods several times a day rather than continuously.
- Gentle, regular movement: Counterintuitively, appropriate movement (ankle pumps, gentle walking as advised) helps circulation and lymphatic drainage far more than staying still.
- Compression, if advised: Some patients are given compression stockings or bandaging specifically to support circulation — follow your surgical team's specific guidance rather than assuming this applies to you.
- Staying consistent with prescribed exercises: A structured, progressive home exercise programme supports circulation throughout recovery, not just in the first few days.
What's Normal vs. What Needs Checking
Generally expected: Gradual, symmetrical swelling around the joint and sometimes the lower limb, that responds somewhat to elevation and rest, and slowly improves over weeks.
Worth contacting your surgical team about, rather than waiting:
- Sudden, significant swelling in one leg only, especially with calf pain or tenderness — this combination can be associated with a blood clot (DVT) and warrants prompt medical assessment
- Swelling accompanied by redness, warmth, or fever — possible signs of infection
- Swelling that's rapidly worsening rather than gradually improving
- Shortness of breath or chest pain alongside leg swelling — seek emergency care immediately, as this can indicate a clot has travelled to the lungs
These red flags are exactly why post-surgical rehabilitation includes ongoing clinical monitoring, not just exercise prescription — a physiotherapist seeing you regularly is well placed to notice a change from your normal recovery pattern.
How Long Does Swelling Typically Take to Settle?
Most of the initial, more dramatic swelling tends to reduce significantly over the first 4–6 weeks, though this varies by individual, surgery type, and activity level. Mild swelling by the end of the day — especially after being more active — is common for several months and isn't usually a cause for concern on its own, particularly if it improves with rest and elevation overnight.
Swelling Management Is Part of the Bigger Recovery Picture
Managing swelling well supports the rest of your recovery — persistent, poorly managed swelling can limit joint range of motion and make strengthening exercises more uncomfortable than they need to be. It's one reason ongoing physiotherapy input in the weeks after surgery is valuable beyond just the exercises themselves.
Rehalign provides HCPC-registered post-surgical physiotherapy at home across the West Midlands, including Birmingham, Solihull, Walsall and Wolverhampton, with visits typically arranged within 48 hours. Book a post-surgical assessment or read more about our orthopaedic and post-surgical rehabilitation.
Frequently Asked Questions
Yes — some degree of swelling around the joint, and often extending into the lower leg, is a normal part of recovery and can persist in a mild form for several months while tissues fully heal.
Sudden swelling in one leg with calf pain, swelling accompanied by redness or fever, or swelling alongside shortness of breath are all signs to contact your surgical team or seek urgent care rather than managing at home — these can indicate infection or a blood clot.
Yes — elevating the operated leg above heart level, rather than just propped slightly, helps fluid drain back toward the body and is one of the most commonly recommended self-management steps alongside gentle movement.
Generally yes, within the guidance given by your surgical or physiotherapy team — appropriate, prescribed movement supports circulation and lymphatic drainage, whereas prolonged inactivity tends to make swelling worse, not better.
Most significant swelling improves over the first 4–6 weeks, though mild residual swelling, especially after activity, is common for several months and generally isn't a concern if it settles with rest and elevation.