Swelling After a Hip Replacement: How Long It Lasts and What Helps

Some swelling after a hip replacement is completely normal, it usually spreads all the way down to the ankle and foot, and for most people it settles over three to six months. I did not expect this one at all. I had braced for pain and for the awkward weeks of precautions, but nobody had warned me that my slim right ankle would vanish into what my daughter kindly called a cankle by the end of most days in the first month. Here is why the leg swells, how long it genuinely takes to go, what actually brings it down, and the small number of warning signs that turn ordinary swelling into a phone call you make today.

Why your leg swells after a hip replacement

Swelling happens for two plain reasons: the operation itself, and gravity. A hip replacement is major surgery on a large joint, and the body responds to that trauma by flooding the area with fluid as part of healing, which is inflammation doing its ordinary job. Then, the moment you are back on your feet, and most people are up and walking the same day or the day after ¹, that fluid obeys gravity and drains down the leg, pooling where it has the furthest to fall. That is why the scar might be at your hip but the puffiness shows up at your knee, your calf, your ankle, and your foot. It is why the swelling is nearly always worse in the evening than first thing in the morning, when a night lying flat has let everything drain back. Understanding that it is fluid and gravity, not damage, took a lot of the fright out of it for me.

How long the swelling lasts

For most people, mild swelling eases steadily over the first three to six months, with a bit of end-of-day puffiness sometimes lingering out to a year. This tracks the wider recovery arc, where the big early gains come fast but full recovery, meaning steady strength, settled tissues, and the last of the swelling gone, takes six to twelve months ². In my own diary the swelling was daily and obvious for the first six weeks, intermittent and evening-only through months two and three, and by month five it only showed up after a long day of gardening or a big walk. If you want the whole shape of that journey, my week by week recovery timeline sets the swelling against everything else that is happening in the same weeks. The rule of thumb that reassured me: swelling that is slowly fading is doing exactly what it should, even when the fade feels maddeningly slow.

What actually brings the swelling down

The measures that help are unglamorous and they work: elevate, pump, ice, keep moving gently, and wear the stocking. Elevating the operated leg above the level of your heart for short spells, propped on cushions so the ankle sits higher than the hip, gives the pooled fluid an easier path back. The ankle pump exercise, flexing your foot up and down, uses the calf muscle as a pump to shift fluid and keep the blood moving, which is one reason physiotherapists are so insistent about it; supervised, progressive exercise after this operation genuinely improves how quickly function returns ². Ice wrapped in a cloth for short periods calms the inflammation. Gentle walking within your limits beats sitting motionless for hours, and if your team sent you home in a compression or anti-embolism stocking, wearing it as instructed does double duty on swelling and clot risk. The one honest caveat is pacing: an over-ambitious day nearly always bought me a fatter ankle that night, and there is no shame in the horizontal hour with your leg up. The full set of early movements your sheet is built from is explained in my hip replacement exercises guide.

When swelling is a warning sign, not a nuisance

Ordinary swelling is even-ish, soft, worse by evening, and better after elevation; the swelling that needs urgent help is sudden, one-sided, and painful. The condition everyone is quietly worried about is a deep vein clot, and the reason the first weeks get so much attention is that this is exactly when the risk is highest, which is why clot-prevention treatment after a hip replacement commonly runs for around 14 to 35 days rather than a few days ³. The pattern to act on is new or worsening swelling in one leg, usually the calf, with pain or tenderness, warmth, and sometimes redness. That is a same-day emergency, not a wait-and-see. Breathlessness, chest pain, or a sudden cough can mean a clot has reached the lung and needs emergency care immediately. There is a second, separate flag: skin that is hot, red, and spreading, especially with a fever, which can signal infection rather than a clot and also needs prompt medical attention. My own scare came one evening in week three when my calf felt tight and I convinced myself the worst; I rang the ward, they talked me through checking it, and it turned out to be ordinary evening swelling, but they were entirely glad I called. The full picture of what can go wrong, and how uncommon most of it is, sits in my notes on hip replacement risks and complications. The wrong belief worth unlearning is that any swelling means you have overdone it or damaged something; usually it just means gravity and healing, and only the specific one-sided painful pattern is the one to fear.

Keeping swelling in proportion

Swelling is a temporary tax on a recovery that, taken as a whole, is one of the most reliable in modern surgery. It helps to remember what the puffy ankle is buying you. Osteoarthritis is a leading cause of lost function and disability worldwide, and a hip replacement reverses that loss for the great majority of people who have one ⁴. The implant itself is built to last, commonly fifteen to twenty-five years, with a large pooled analysis suggesting roughly six to eight in ten are still working at twenty-five years ⁵. Set against that, a few months of managing a swollen leg with cushions and ankle pumps is a small and passing thing. Keep watching for the one dangerous pattern, keep the leg moving and elevated, and let the ordinary swelling fade on its own schedule, which it almost always does.

This is general information from a patient’s perspective, checked for accuracy, and not medical advice. Your surgery, your health, and your recovery are particular to you. Follow the instructions from the team who operated on you, and if any swelling worries you, especially the one-sided painful kind, contact a qualified clinician straight away.