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Recovering after a total knee replacement
A total knee replacement (TKR) replaces the worn surfaces of the knee joint with an artificial implant, most often because of osteoarthritis. It is one of the most common joint operations, and most people see significant improvements in pain, function and quality of life within three to six months [10].
Physiotherapy usually begins in hospital, often on the day of surgery, with the focus on getting you moving and home safely [1]. After discharge, however, the amount of rehabilitation people receive varies [1], and some find their progress slows or stalls once hospital-based support ends. This is where ongoing physiotherapy can make a real difference. Below are the questions people most often ask about recovery. Numbers in square brackets refer to the reference list at the end.
1. How long does it take to recover from a knee replacement?
Most people notice significant improvements in pain, function and quality of life within three to six months of surgery [10]. Many continue to see gradual gains in strength, stamina and confidence for up to a year.
National guidance recommends that people who are not reaching their goals with self-directed rehabilitation are offered supervised physiotherapy, either individually or in a group [1]. Physiotherapy exercise after discharge from hospital has been shown to improve physical function in the early months of recovery [3].
If you have been discharged from hospital physiotherapy and feel your recovery has slowed, your physiotherapist can reassess your knee, set new goals with you, and provide the one-to-one support you need to keep progressing.
2. How much should my knee bend, and by when?
Different daily activities need different amounts of knee bend. Walking on level ground and slopes needs less than 90 degrees, stairs and getting out of a chair need between 90 and 120 degrees, and getting in and out of a bath needs around 135 degrees. Around 110 degrees is considered a suitable rehabilitation goal for most people [4].
Being able to fully straighten the knee is just as important, as it allows you to walk with a more normal pattern.
The largest gains in movement usually happen in the first few weeks, which is why consistent rehabilitation matters. If your knee bend or straightening has stopped improving after hospital rehabilitation, your physiotherapist can measure how far it bends and straightens, check what is holding you back and adjust your programme to help with everyday activities.
3. Is it normal to still have pain or swelling months after surgery?
Yes. Pain, swelling and warmth around the knee are common for several months as the tissues heal. A recent review found that around 22% of people still reported pain three months after knee replacement, and 12% to 15% had longer-term pain up to two years later [5].
For most people, these symptoms settle gradually. If pain or swelling is still limiting you after your hospital follow-up has ended, your physiotherapist can assess what is contributing to it, help you manage it, pace your activity so you keep progressing without flare-ups, and liaise with your surgeon or GP if anything needs checking.
4. How soon can I walk without crutches or a stick?
This varies from person to person. Rehabilitation, including getting up and walking, usually begins very soon after surgery, often on the same day [1]. Most people progress from a frame or crutches, to a single stick, to walking unaided over the following weeks.
Rather than going by a set date, your physiotherapist will judge when you are ready to reduce your walking aid based on your walking pattern, balance, strength and confidence. If you are still relying on a stick or walking with a limp after discharge, physiotherapy can help correct this before it becomes a habit that is harder to change.
5. When can I drive after a knee replacement?
Follow your surgical team’s advice before returning to driving. The braking-time findings below are research results, not clearance to drive at that time.
A review of studies measuring braking reaction time found that it returned to pre-operative levels around four weeks after a right knee replacement [6].
Before driving, you should be off any painkillers that cause drowsiness, be able to perform an emergency stop safely, and check with your surgeon and your insurance provider. Your physiotherapist can assess your strength, movement and control to help you judge when you are physically ready.
6. What exercises should I do after a knee replacement, and how often?
Every knee replacement and every person is different, so there is no single programme that suits everyone. Most people leave hospital with a starting set of exercises, but these need to be progressed as your knee recovers. Your physiotherapist will assess your knee movement, strength, balance and walking, and will provide you with a tailored set of exercises that are progressed as you improve.
Research shows that physiotherapy exercise after knee replacement improves physical function in the short term, whether it is delivered in a clinic or as a home programme supported by a physiotherapist [3]. If you are not reaching your goals with exercises on your own, supervised physiotherapy is recommended [1].
7. Why is my knee so stiff, and is it too late to improve it?
Stiffness is very common after knee replacement, particularly in the early weeks, and is usually caused by swelling, pain and healing tissue around the joint. It is often worse first thing in the morning or after sitting for a while.
It is rarely too late to make improvements, although the greatest gains are made early. If stiffness is still a problem after your hospital rehabilitation has finished, your physiotherapist can work on your knee's movement, help manage swelling, and monitor your progress. If your movement is not improving as expected, they will liaise with your surgeon about further options.
8. Can I kneel after a knee replacement?
Many people can, even if they think they can't. In one study, only 37% of people believed they could kneel after their knee replacement, but 81% were able to when tested [7]. People with more knee bend found kneeling easier [7].
Kneeling may feel uncomfortable or unusual at first, particularly over the scar. Your physiotherapist can help you build the movement and confidence to kneel, and advise on safe ways to practise.
9. When can I return to work and to activities like golf, walking or cycling?
Most people who were working before surgery return to work. Studies report that 71% to 83% of people had returned to work three to six months after knee replacement, with an average time of 8 to 12 weeks [8]. This depends on the type of work you do.
Many people also return to sport and leisure activities. Between 36% and 89% of people returned to sport after total knee replacement, typically around 13 weeks after surgery, with most choosing lower-impact activities such as walking, cycling, swimming and golf [9].
Hospital rehabilitation tends to focus on everyday tasks such as walking, stairs and getting in and out of a chair. Private physiotherapy can take you further, planning a gradual return to work or sport and building the strength, stamina and movement needed for your specific job or activity.
10. Should I use ice, and how can I sleep comfortably after surgery?
Cold therapy may help reduce pain and blood loss in the first days after surgery, although its effect on longer-term function is uncertain [2]. Always protect your skin and follow the advice of your healthcare team.
Disturbed sleep is common in the first few weeks. Timing your pain relief before bed and finding a comfortable, supported position can help. Avoid resting for long periods with a pillow directly under the knee, as this can make it harder to regain full straightening. Your physiotherapist can advise on positioning and managing night-time discomfort.
When to see a physiotherapist
Consider booking an assessment if:
- You have finished your hospital physiotherapy but feel your recovery has stalled
- You are still using a walking aid or walking with a limp
- Pain, swelling or stiffness is limiting your daily activities
- You want help returning to work, sport or hobbies
When to seek medical advice
Contact your surgical team, GP or NHS 111 promptly if you develop worsening pain or swelling, new calf pain, fever, or redness or discharge from the wound. Call 999 for sudden breathlessness or chest pain, particularly with leg pain or swelling.
References
- National Institute for Health and Care Excellence (NICE). Joint replacement (primary): hip, knee and shoulder. NICE guideline NG157. London: NICE; 2020. Available from: https://www.nice.org.uk/guidance/ng157
- Aggarwal A, Adie S, Harris IA, Naylor J. Cryotherapy following total knee replacement. Cochrane Database Syst Rev. 2023;9:CD007911. doi:10.1002/14651858.CD007911.pub3
- Artz N, Elvers KT, Lowe CM, Sackley C, Jepson P, Beswick AD. Effectiveness of physiotherapy exercise following total knee replacement: systematic review and meta-analysis. BMC Musculoskelet Disord. 2015;16:15. doi:10.1186/s12891-015-0469-6
- Rowe PJ, Myles CM, Walker C, Nutton R. Knee joint kinematics in gait and other functional activities measured using flexible electrogoniometry: how much knee motion is sufficient for normal daily life? Gait Posture. 2000;12(2):143–155.
- Cheng HY, Beswick AD, Bertram W, Siddiqui MA, Gooberman-Hill R, Whitehouse MR, et al. What proportion of people have long-term pain after total hip or knee replacement? An update of a systematic review and meta-analysis. BMJ Open. 2025;15(5):e088975.
- van der Velden CA, et al. When is it safe to resume driving after total hip and total knee arthroplasty? A meta-analysis of literature on post-operative brake reaction times. Bone Joint J. 2017;99-B(5):566–576. doi:10.1302/0301-620X.99B5.BJJ-2016-1064.R1
- Hassaballa MA, Porteous AJ, Newman JH. Observed kneeling ability after total, unicompartmental and patellofemoral knee arthroplasty: perception versus reality. Knee Surg Sports Traumatol Arthrosc. 2004;12(2):136–139.
- Tilbury C, Schaasberg W, Plevier JWM, Fiocco M, et al. Return to work after total hip and knee arthroplasty: a systematic review. Rheumatology (Oxford). 2014;53(3):512–525.
- Witjes S, Gouttebarge V, et al. Return to sports and physical activity after total and unicondylar knee arthroplasty: a systematic review and meta-analysis. Sports Med. 2016;46.
- Recovery evidence: Clinical Course of Pain and Function Following Total Knee Arthroplasty: A Systematic Review and Meta-Regression. 2021. Available from: https://pubmed.ncbi.nlm.nih.gov/34275710/ ; van Egmond JC, Hesseling B, Verburg H, Mathijssen NMC. Short-term functional outcome after fast-track primary total knee arthroplasty: analysis of 623 patients. Acta Orthop. 2021;92(5):602–607. doi:10.1080/17453674.2021.1925412