Most people resume sex after knee replacement at around FOUR to SIX weeks, once the wound has fully healed and they feel comfortable. Some feel ready sooner, and that is fine if your surgeon agrees.
A new knee does not carry the dislocation risk that a new hip does. What limits you is pain, swelling, the healing wound and pressure on the front of the knee. Let those set the pace.
The most comfortable positions are usually lying on your back, or lying on your side with a pillow supporting the knee. For the first few weeks, avoid kneeling on the new knee and avoid twisting it.
Your surgeon’s instructions come first. If they differ from anything here, use theirs.
When to resume sex after knee replacement
Timings vary between surgeons and between people. These are the typical ranges.
- Weeks 0 to 2: Swelling is at its worst, the wound is still closing and you tire quickly. Most people are not ready yet.
- Weeks 2 to 4: Stitches or clips are usually out and the wound is closing. Some people start again gently, in positions where the knee is supported and takes no weight.
- Weeks 4 to 6: The most common time to resume. Pain is lower, you are walking further and the knee bends more.
- From about 3 months: Most people have few limits left. Kneeling may still feel odd or uncomfortable for longer. See knee replacement recovery time week by week
The OrthoInfo guide to activities after total knee replacement says the same: many people can resume sexual activity within several weeks, after checking with their doctor.
What actually limits you
- Pain: The knee is sore for weeks, and pain makes it hard to relax. Use it as your guide. A dull ache is fine. Sharp pain means change position or stop.
- Swelling: The new knee swells with activity and is often worse by evening. Sex is exercise, so expect a little extra swelling afterward. See swelling after knee replacement
- The wound: Wait until it is fully closed and dry, with no scabs or leaking. Avoid pressure or rubbing directly on the scar while it heals.
- Kneeling pressure: Kneeling on the new knee is uncomfortable early on and can feel strange for months. Many people kneel comfortably by a year, but some never like it. See kneeling after knee replacement
- Twisting: Turning your body while the foot is planted strains the healing tissue around the joint. Move the whole leg instead.
The best positions after knee replacement surgery
The aim is simple: the operated knee is supported, takes no weight and does not twist. These suit both women and men.
- On your back: The person who had surgery lies flat with the operated leg straight or slightly bent, and the partner takes the more active role. A pillow along the calf, rather than right under the knee, supports the leg and lets the knee stay straight.
- On your side, operated knee on top: Lie on your non-operated side with a pillow between your knees. The pillow stops the top knee pressing on the bottom one and stops it twisting.
- Lying on the operated side: This is usually uncomfortable early because it puts pressure on the wound. Leave it until the scar is no longer tender.
- Kneeling positions: Leave any position that puts weight through the new knee until kneeling feels comfortable, which for most people is several months.
A new knee won’t pop out. Let pain and swelling set the pace, not fear.
What helps
- Talk with your partner: Pain medicines and tiredness can lower desire, and partners often worry about hurting you. A short, honest conversation about what feels fine makes it easier for both of you.
- Time your pain relief: Taking your usual painkiller 30 to 60 minutes beforehand helps you relax.
- Pick your time of day: Swelling is usually lower earlier in the day than late at night.
- Ice and raise it afterward: 15 to 20 minutes of ice with the leg up settles any extra swelling.
- Keep up your exercises: More bend and better strength make every position easier. See exercises after knee replacement
What’s normal
- Extra ache or swelling the next day: This is normal if it settles within a day or so.
- Low desire in the first weeks: Painkillers, broken sleep and tiredness all play a part. It usually returns as you recover.
- Clicking from the knee: The metal and plastic parts can click. If it doesn’t hurt, it is harmless.
- Feeling better than before: Many people find sex easier after surgery because the arthritis pain that held them back is gone.
Go to the emergency department if
- You become suddenly short of breath or have chest pain, which can mean a blood clot has reached the lung.
Call your surgeon today if
- You have new pain, swelling, warmth or tenderness in your calf, which can be a sign of a blood clot. See blood clot after surgery
- Your wound opens, leaks fluid, or the redness around it is spreading.
- You develop a fever, or the knee becomes suddenly hotter, more swollen and more painful.
Mention it at your next review if
- Sex is still painful three months after surgery.
- Your knee does not bend or straighten enough to get comfortable by six weeks. See knee stiffness after knee replacement
- Low desire or erection problems carry on after you have stopped your pain medicines.
After a knee replacement, sex is limited by comfort, not by danger: protect the wound and the swelling, and the rest comes back.