Physical therapy is one of the most important parts of recovering from knee replacement. It helps you bend and straighten your new knee, walk with confidence and get back to the things you enjoy. Here is what to expect, step by step.
Quick takeaways
- Physical therapy usually starts within a day of knee replacement surgery.
- Early goals are bending and straightening the knee, walking safely and managing swelling.
- Many people return to most daily activities in about six weeks, with continued gains over several months.
- Doing your home exercises consistently is one of the best things you can do for recovery.
Why physical therapy matters
A new knee joint needs strong muscles and good movement to work well. Therapy helps prevent stiffness, builds strength in the thigh and hip, improves balance and teaches safe ways to walk, climb stairs and get in and out of bed or a car.
Knee replacement recovery timeline
Everyone heals at a different pace, but recovery often looks something like this:
- Days 1–3: Standing and walking with a walker, gentle exercises and managing pain and swelling.
- Weeks 1–3: Increasing how far the knee bends and straightens, walking farther and building independence with daily tasks.
- Weeks 4–6: Walking with less support, often moving from a walker to a cane, and returning to many daily activities.
- Months 2–3 and beyond: Building strength and endurance. The knee can keep improving for up to a year.
Common exercises after knee replacement
Your therapist will choose exercises that fit your progress. Early exercises often include:
- Ankle pumps to keep blood moving
- Quad sets, tightening the thigh muscle to straighten the knee
- Heel slides to gently increase bending
- Straight leg raises to build thigh strength
- Walking, a little farther each day
Always follow the exercises and limits your surgeon and therapist give you.
Small, steady effort every day adds up to a stronger knee.
Rehab at home or in a facility?
Many people go home after surgery with home or outpatient therapy. Others benefit from a short stay in subacute rehab, where therapy and nursing care are available every day. This can be a good choice for people who live alone, have stairs at home, manage other health conditions or need more help getting around.
Tips for a smoother recovery
- Take pain medication as prescribed so you can do your exercises comfortably.
- Elevate your leg and use ice as directed to manage swelling.
- Do your home exercises every day, even after formal therapy ends.
- Prepare your home before surgery. Our fall prevention checklist covers simple changes room by room.
- Keep building strength long term. See our guide to strength training for older adults.
When to call your surgeon
Contact your surgeon right away for fever, increasing redness or drainage at the incision, sudden swelling, calf pain or shortness of breath.
Recovering from a hip procedure instead? Read our guide to recovering from hip replacement or hip fracture.
Frequently asked questions
How long is rehab after knee replacement?
Formal physical therapy often lasts several weeks to a few months. Many people return to most daily activities in about six weeks, and the knee can keep improving for up to a year.
When does physical therapy start after knee replacement?
Usually within 24 hours of surgery. Getting up and moving early helps prevent stiffness and blood clots and speeds recovery.
What exercises are done after knee replacement?
Common early exercises include ankle pumps, quad sets, heel slides and straight leg raises, along with walking. Your therapist will tailor exercises to your progress.
Is it normal to have swelling after knee replacement?
Yes. Some swelling is common for weeks to months. Elevating the leg, using ice as directed and staying active help. Contact your surgeon about sudden or severe swelling, redness or calf pain.
Do I need rehab in a facility after knee replacement?
Many people go home with outpatient or home therapy, while others benefit from a short stay in subacute rehab, especially if they live alone, have other health conditions or need extra help getting around.
This article is general information, not medical, legal or financial advice. Coverage rules can change, so confirm details with Medicare, your plan or your care team.
