Patients rarely ask this directly. They ask how long the hospital stay is, or when they can walk, and the real question sits underneath. It deserves a straight answer, because vague reassurance is what produces frightened patients on day three.

The first forty eight hours

This is the worst of it, and it is managed rather than endured. Multimodal pain control, which means several medicines acting by different routes rather than one strong one, combined with local anaesthetic placed around the knee during surgery, keeps most patients comfortable enough to stand and walk the same day or the next morning.

Expect discomfort you can talk through. If you are in pain you cannot talk through, that is information for your team, not something to tolerate quietly.

Week one to week three

The constant pain settles quickly. What replaces it is a tight, heavy, swollen feeling and sharp pain on specific movements, usually bending past a certain point and getting up from low seats. Nights are often worse than days. This is normal and it is the phase people are least warned about.

Physiotherapy in this window is uncomfortable by design. The discomfort of a stretch is not damage. Learning to tell that apart is most of what the first month teaches you.

Month two to month six

Most patients are off strong painkillers by three to four weeks and describe aches rather than pain by six to eight weeks. Swelling comes and goes with activity for months, which surprises people who expected a straight line.

Full comfort is not a six week event. A reasonable expectation is a knee that feels largely unremarkable between six and twelve months, with some residual awareness of it that may never fully disappear.

What is not normal

Pain that is increasing rather than decreasing after the first fortnight. Fever with a hot, angry wound. Calf pain and swelling. A knee that will not bend past 70 or 80 degrees at six weeks despite physiotherapy. Each of these needs to be seen rather than waited out.

More detail here: https://www.mayurajcc.com/knee-replacement-guides/pain-after-knee-replacement-surgery and https://www.mayurajcc.com/knee-replacement-guides/first-week-after-knee-replacement and https://www.mayurajcc.com/knee-replacement-guides/physiotherapy-after-knee-replacement