Exercises After Knee Replacement: From Early Recovery to Strength Training
- Tom Morgan, Chartered Physiotherapist
- Aug 9
- 4 min read
Exercise after a total knee replacement should change as your recovery changes. The exercises that are useful in the first few days after surgery are not meant to remain your entire rehabilitation programme for the next six months.
Early rehabilitation focuses on circulation, knee movement, quadriceps activation and safe walking. As pain and swelling settle and your confidence improves, the programme should progress towards functional strength, stairs, balance, cycling and eventually more substantial resistance training where appropriate.
The first few days: movement and muscle activation
In the first days after surgery, the goal is not heavy strengthening. Common early exercises include ankle pumps, quadriceps sets, gluteal activation, gentle knee bending and supported walking with the aid recommended by your hospital team.
The knee is usually swollen and the quadriceps can feel difficult to activate. Repeated attempts to tighten the thigh muscles are useful even when the contraction initially feels weak.
Week 1: work on bending and straightening
During the first week, knee range of movement becomes an important part of rehabilitation. Heel slides and other controlled bending exercises can help flexion, while extension work helps restore the ability to straighten the knee.
Do not focus only on bending. Good knee extension is important for standing and walking, and prolonged resting with the knee held in a bent position can work against that goal.
Around week 2: add functional strengthening
As walking and basic movement become easier, rehabilitation can begin to include more functional exercises. Depending on your progress, these may include sit-to-stands, mini squats, standing calf raises, hip strengthening and continued knee mobility work.
The aim is controlled movement rather than forcing repetitions through sharp pain. Swelling can temporarily make the knee feel stiffer, so exercise progression and swelling management need to work together.
Weeks 3–6: build strength and walking control
By the three-to-six-week stage, rehabilitation should generally become more demanding if your recovery allows. Exercises can progress towards stronger sit-to-stands, squats, step-ups, step control, quadriceps strengthening, calf work and balance exercises.
Stationary cycling can also be useful once you have enough knee movement to complete the pedal revolution comfortably. Early cycling is usually introduced with little or no resistance before resistance is increased gradually.
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Weeks 6–12: transition towards progressive resistance
For many suitable patients, the six-to-twelve-week stage is when rehabilitation starts to look more like conventional strength training. The goal is to continue improving quadriceps strength, lower-limb control, stairs, walking endurance and confidence.
Gym-based work may begin during this period once walking, stairs and basic exercises are controlled. Exercises such as leg press, hamstring curls, cycling and progressively loaded functional movements can be introduced gradually where appropriate.
Months 3–6: keep progressing rather than stopping
Pain can improve before strength fully returns. By three months many people are functioning much better, but there may still be a meaningful strength difference between the operated and non-operated leg.
Later rehabilitation can progress towards more challenging resistance, step-down control, split-stance exercises, hip and calf strengthening and other exercises that support the activities you want to return to.
How often should strength exercises be done?
Early movement and activation exercises may be performed more frequently, while genuinely challenging strength sessions usually need recovery between them. As your programme becomes harder, two to three structured lower-limb strength sessions each week can be a useful pattern for many people, depending on individual advice and recovery.
How do you know when to progress an exercise?
Progress when you can perform the current exercise with good control and the knee is tolerating the workload. Progression can come from additional resistance, a harder exercise variation, more repetitions or a greater movement range. Increase gradually rather than changing everything at once.
What if exercise makes the knee swell?
Some increase in swelling after a busier day or a new exercise can occur during recovery. A large flare that repeatedly leaves the knee much more painful, swollen or stiff can be a sign that the overall dose is too high. Reduce the workload and build back more gradually rather than abandoning exercise completely.
When should you seek further advice?
Contact your surgical team, GP or physiotherapist if pain, swelling, movement or function is moving in the wrong direction rather than gradually improving. Seek urgent medical attention for symptoms such as sudden breathlessness or chest pain, marked one-sided calf swelling, a hot increasingly red joint with fever, wound concerns, sudden loss of function or other symptoms your surgical team has told you require urgent review.
The main principle
Your knee replacement exercise programme should progress with you. Early exercises help you begin moving and activating the muscles. Later rehabilitation should challenge strength, control and endurance enough to prepare you for normal daily activity and the longer-term goals that matter to you.
This article provides general information and does not replace advice from your own surgeon, physiotherapist or medical team. Your specific surgical restrictions and rehabilitation instructions should take priority.
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