Knee replacement exercises at home help restore movement, strengthen the muscles around the knee, improve walking, and support recovery after surgery. Common exercises include ankle pumps, thigh muscle contractions, gentle knee bends, leg raises, and short walks. Start with the exercises recommended by your surgeon or physical therapist, perform them regularly, and increase activity gradually as your strength and comfort improve.
Recovery after knee replacement takes time, and a home exercise routine is an important part of the process. The right exercises depend on how recently the operation took place, your current mobility, and the instructions provided by your healthcare team.
Why are home exercises important after knee replacement?
After knee replacement surgery, the muscles around the knee may be weaker, and swelling or discomfort can make bending and straightening the leg difficult. Regular, controlled movement helps you work toward better knee flexibility, muscle strength, and independence with everyday activities.
According to the American Academy of Orthopaedic Surgeons (AAOS), early movement, walking, and targeted exercises are important parts of recovery. Your exercise program should follow the guidance of your surgeon and physical therapist rather than a general routine alone.
Which knee replacement exercises can you do at home?
The following exercises are commonly included in knee replacement rehabilitation. Your physical therapist may recommend some or all of them, depending on your progress. Follow the prescribed repetitions and movement limits, especially during the first few weeks after surgery.
1. Ankle pumps
Ankle pumps involve moving your feet up and down while sitting or lying down. They encourage movement in the lower legs and are often introduced soon after surgery.
- Lie on your back or sit with your legs supported comfortably.
- Point your toes away from your body, then pull them toward your shins.
- Repeat the movement slowly and rhythmically without forcing your ankle.
- Continue for the duration recommended by your healthcare team.
Ankle pumps can be particularly useful when you are spending more time resting. They do not replace prescribed blood clot prevention measures, medication, compression garments, or walking when these have been recommended.
2. Thigh muscle contractions (quadriceps sets)
Quadriceps sets strengthen the muscles at the front of your thigh, which help straighten and stabilize the knee.
- Lie on your back with the operated leg resting straight on the bed.
- Tighten the muscles at the front of your thigh.
- Gently press the back of your knee toward the bed without lifting your heel.
- Hold the contraction for about 5 to 10 seconds if comfortable, then relax.
Repeat according to your prescribed program. This exercise can be useful when bending or lifting the leg is still difficult. Focus on activating the thigh muscles rather than straining the knee.
3. Heel slides for knee bending
Heel slides help improve knee bending by allowing the foot to move gradually toward the body while the leg remains supported.
- Lie on your back with both legs extended comfortably.
- Slowly slide the heel of the operated leg toward your buttocks.
- Bend the knee only as far as you can comfortably manage within your prescribed limits.
- Pause briefly, then slide the foot back to straighten the leg.
Move slowly and avoid forcing the knee into a deeper bend. Your physical therapist can show you how to use a towel or another support if assistance is needed. Progress should be guided by your rehabilitation plan rather than by comparison with someone else's recovery.
4. Knee straightening with heel support
Regaining the ability to straighten the knee is important for standing and walking. This exercise helps you practice straightening the leg while supporting the heel.
- Lie on your back with your leg extended.
- Place a small rolled towel under your heel or ankle, leaving the knee unsupported.
- Relax the leg and allow the knee to straighten gently.
- If instructed, tighten your thigh muscle briefly while maintaining the position.
Do not place a pillow directly under the knee for prolonged periods unless your healthcare team specifically instructs you to do so. Stop if the position causes significant pain or puts pressure on the surgical wound.
5. Straight leg raises
Straight leg raises work the thigh and hip muscles while you keep the operated knee straight. They are appropriate only when you can maintain control of the leg and your therapist has cleared you to perform them.
- Lie on your back with the operated leg straight.
- Tighten your thigh muscle to keep the knee straight.
- Slowly lift the leg a short distance from the bed.
- Hold briefly if comfortable, then lower it slowly.
Avoid this exercise if your knee bends unintentionally during the lift or you cannot control the leg. Your therapist may modify the movement or recommend a different exercise until your strength improves.
6. Seated knee bends
Seated knee bends help you practice bending the knee while sitting in a firm, stable chair. They can be useful when working toward comfortable sitting, standing, and other daily activities.
- Sit with your back supported and both feet resting on the floor, if comfortable.
- Slowly slide the operated foot backward to bend the knee.
- Move only within your prescribed range of motion.
- Hold briefly if instructed, then slide the foot forward again.
Keep your movements controlled and avoid using your body weight to force the knee farther back. If you need help positioning your foot, ask your physical therapist to demonstrate a safe modification.
7. Short, regular walks
Walking is an important part of recovery because it allows you to practice moving the knee while rebuilding everyday mobility. Begin with the distances recommended by your healthcare team and use your walker, crutches, or cane as instructed.
- Stand upright and keep your weight distributed as advised.
- Move your walking aid forward before stepping with the operated leg, following the technique taught by your therapist.
- Take short, controlled steps without rushing or twisting your body.
- Rest when needed and increase walking time gradually as your recovery allows.
The NHS guidance on knee replacement recovery emphasizes following the exercises recommended by your physiotherapist and using walking aids during recovery as needed. Do not stop using an aid simply because you can manage a few steps without it.
How often should you exercise after knee replacement?
Your surgeon or physical therapist should set your exercise schedule, including the number of repetitions, sessions per day, and appropriate walking duration. Some gentle movements may be recommended several times throughout the day, while strengthening exercises may follow a different schedule.
The AAOS exercise guide describes programs that may involve daily exercise sessions and regular walking, but the appropriate amount varies with recovery progress and individual instructions. You do not need to complete every exercise at every session. Consistent, controlled practice is more useful than pushing through excessive fatigue or pain.
If you miss a session, resume your prescribed routine when appropriate rather than doubling the next session. Ask your therapist how to adjust the schedule if swelling, fatigue, or other practical difficulties make the current plan hard to follow.
How should exercises change as recovery progresses?
Rehabilitation generally moves from gentle muscle activation and supported movement toward more demanding strength, balance, and walking activities. These stages are flexible, not fixed deadlines. Your progress may differ depending on your health, surgical procedure, strength before surgery, and any complications.
Early recovery
During the initial period, the focus is often on ankle pumps, thigh contractions, gentle knee bending and straightening, safe transfers, and short assisted walks. Your healthcare team will explain how much weight you may place on the operated leg and how to protect the incision.
Building movement and strength
As your mobility improves, your physical therapist may increase walking distance, add standing knee bends, or introduce other exercises that improve control and strength. The progression should be based on your ability to perform movements safely, not simply the number of days since surgery.
Returning to everyday activities
Later rehabilitation may include more challenging balance exercises, functional strengthening, stair practice, or a stationary bicycle if approved. Do not add ankle weights, resistance bands, deep squats, or other demanding exercises without checking that they are suitable for your stage of recovery.
For additional information about recovery and activity after surgery, MedlinePlus guidance on knee joint replacement discharge explains the importance of following your prescribed exercise program, using walking aids appropriately, and taking precautions to protect the new knee.
How can you exercise safely at home?
A safe environment makes it easier to follow your exercise plan without unnecessary falls or strain. Before starting a session, choose a stable surface and keep any walking aid within reach. Wear secure, nonslip footwear when standing or walking, and have someone nearby if your therapist has advised assistance.
- Use a firm chair and a stable bed for supported exercises.
- Keep floors clear of loose rugs, electrical cords, and other tripping hazards.
- Avoid twisting or pivoting on the operated leg.
- Use handrails and your prescribed walking aid when practicing stairs.
- Do not kneel on the operated knee until your surgeon says it is appropriate.
- Follow the wound-care instructions provided by your surgical team.
Do not assume that an exercise is safe just because it is commonly used in rehabilitation. The right technique and timing matter, particularly if you have restrictions related to the surgery or other health conditions.
What should you do about pain and swelling after exercise?
Some discomfort, stiffness, and swelling can occur during recovery, and activity may temporarily increase these symptoms. However, exercise should not require you to push through sharp, escalating, or unusual pain. Reduce or stop the movement if symptoms become concerning and contact your healthcare team for advice.
Resting with the leg elevated and applying a cold pack wrapped in a towel may help manage swelling if your care team has approved these measures. Keep the incision protected, avoid placing ice directly on the skin, and follow any instructions about the duration and frequency of cold therapy.
Contact your surgeon promptly if pain or swelling is increasing rather than improving, the wound becomes increasingly red or begins draining, or you develop a fever. Sudden shortness of breath, chest pain, or new significant calf pain or swelling may indicate a serious complication, including a blood clot. Seek emergency medical care for chest pain or sudden breathing difficulty.
When should you contact your physical therapist or surgeon?
Ask for professional guidance if you are unsure how to perform an exercise, cannot maintain the prescribed knee position, experience repeated buckling, or find that swelling or pain prevents you from following your program. Your therapist can assess your movement and adjust the exercise to match your current ability.
Do not try to make up for slow progress by forcing a deeper bend or adding extra resistance. If your recovery changes unexpectedly, your healthcare team can determine whether your routine needs adjustment or whether you should be examined.
How can you stay consistent with home rehabilitation?
A simple daily routine can help you remember your exercises and monitor how your knee responds. Keep your written instructions nearby, perform the exercises in the order recommended by your therapist, and record any difficulties or changes you want to discuss at your next appointment.
Plan sessions around rest periods and necessary daily activities. If you become tired, ask whether your routine can be divided into shorter sessions. Keep follow-up appointments even when progress seems satisfactory, because your care team can assess movement, strength, walking technique, and readiness for more demanding activities.
The goal is steady, safe improvement in movement and independence. Regular practice, appropriate rest, and communication with your rehabilitation team are more important than trying to recover on a fixed timetable.