Knee Replacement Prehab Exercises: The Complete Pre-Surgery Guide

Knee replacement prehab exercises are the strength, mobility, balance, and low-impact conditioning work you may do in the weeks before surgery. The aim is simple: arrive with movement patterns you recognize and as much comfortable capacity as your situation allows. Research suggests prehab may support early strength and function for some people, but results differ between studies and it is not a promise about any individual recovery (Pinto et al., AHRQ; JOSPT review).

Think of this guide as a starting point for a conversation, not a test you need to pass. A 2022 evidence review found that most knee-prehab study programs combined strengthening and flexibility work; balance, task practice, and conditioning appeared less consistently (AHRQ review). You may need a lighter, shorter, or different plan based on your symptoms, balance, other conditions, and surgery date.

What prehab may help with — and what it cannot promise

The evidence is encouraging but mixed. The AHRQ review rated much of the total-knee-replacement prehab evidence low strength, while a 2025 review of reviews associated structured prehab with better early strength, function, and quality-of-life measures in some studies; the quality of the included reviews ranged from critically low to moderate (Pinto et al., AHRQ; JOSPT review). A separate 2025 meta-analysis suggests prehab may ease pain, though it found less consistent changes in knee function (Hu et al.).

That uncertainty is useful information. A practical prehab plan may help you practice movements you are likely to see again after surgery, such as tightening the thigh, getting up from a chair, and walking with support. It cannot predict your recovery, replace your post-operative plan, or override the instructions you receive from your surgical team.

Knee replacement prehab exercises: the six-week framework

Published programs have begun roughly two to twelve weeks before surgery. This six-week, three-sessions-per-week structure borrows the common components from that research and leaves recovery days between sessions (AHRQ review). A 2026 trial of pre-operative maximal-strength work used progressive resistance training three times weekly, while another trial supports a simple home approach with a check-in for many participants (Izadi et al.; Simpson et al.).

The table is a framework, not a target. More load is not automatically better: use a progression only when the earlier version is comfortable, controlled, and agreed with your surgical team. Guidance for resistance exercise also suggests that the joint angle and range you use can matter, especially when the knee is irritable (Muscles, Ligaments and Tendons Journal).

Build each session in three parts

1. Start with mobility and muscle activation

Begin with five easy minutes of walking, a stationary bike, or gentle marching if that feels steady. Then use quad sets and heel slides to rehearse thigh tightening and knee bending. The AAOS exercise guide includes both as common movements around total knee replacement, which makes them familiar patterns worth practicing before surgery too (AAOS OrthoInfo).

1. Quad sets: Sit or lie with the leg straight, tighten the front of the thigh, hold for five to ten seconds, then relax. Try three sets of 10 only if the movement is comfortable.
2. Heel slides: Slowly draw the heel toward you, bending the knee only as far as feels manageable, then slide it back out. Try two sets of 10 with a smooth, unforced motion.
3. Straight leg raises: Tighten the thigh first, lift the straight leg a few inches, pause, and lower slowly. Two sets of 10 per side is a reasonable beginning point for many people.

These are not endurance contests. If you cannot keep the thigh tight during a leg raise, reducing the height, repetitions, or hold may be a more useful choice than forcing the full version. The AAOS guide similarly emphasizes controlled movement and gradual exercise progressions (AAOS OrthoInfo).

2. Add hip, glute, and core strength

Your knee does not move in isolation. Standing hip abduction, standing hip extension, glute bridges, seated marches, and bird-dog are options for building general lower-body and trunk control. Start with two sets of 8 to 10, use a counter or sturdy chair for balance, and keep the movement slow. The research base for prehab commonly includes strengthening and balance-related elements, but it does not identify one universal best exercise list (AHRQ review).

In weeks three and four, a chair-supported mini squat may be appropriate if your team agrees. Bend only a small amount at first, keep the knees tracking comfortably, and use your hands for support as needed. A study of closed- and open-chain quadriceps work suggests that exercise range deserves attention, so reducing depth is a sensible modification when a deeper bend is not comfortable (Muscles, Ligaments and Tendons Journal).

3. Practice useful movement patterns and optional conditioning

During weeks five and six, sit-to-stands from a sturdy chair may help you rehearse a controlled stand and sit. Supported low step-ups may be another option only after your surgical team approves them. The AAOS guide includes supported stair practice in its post-operative exercise material, and its guidance to increase step height gradually is a useful reminder to keep this progression conservative (AAOS OrthoInfo).

Low-impact conditioning is optional, not a requirement. Easy walking, stationary cycling, or pool walking for 10 to 20 minutes may fit after strength work if you can do it comfortably. Aerobic training appeared in fewer prehab studies than strengthening and flexibility, while a small aquatic-exercise trial is one reason water-based movement may be worth discussing if land exercise is difficult (AHRQ review; Kim et al.).

How to progress without chasing numbers

Use the smallest change that makes sense: an extra repetition, a slightly longer hold, a little less hand support, or a light ankle weight after the unweighted movement is consistently comfortable. You may keep the same version for several sessions. The goal is repeatable, controlled practice rather than testing your limits.

A simple decision sequence can help:

1. Choose a version you can do with steady form and no sharp pain.
2. Repeat it on non-consecutive days and notice how the knee feels during and afterward.
3. Change just one thing at a time, such as repetitions or resistance.
4. Return to the easier version if symptoms become sharper, the knee locks or gives way, or your balance is uncertain.

NICE recommends that joint-replacement care be planned with the person receiving care and the multidisciplinary team; that makes your own surgical plan more important than a generic online progression (NICE NG157).

When to pause and check in

Stop an exercise if you feel sharp or stabbing pain, the knee locks or gives way, or you cannot maintain balance. Chest pain, severe shortness of breath, calf pain or swelling, or a fall need prompt attention rather than another set. For symptoms that are not urgent but keep recurring, pause the movement and ask your surgical team how they would like you to modify the plan.

It may also be sensible to keep the final days before surgery simple. Follow the timing, activity, medication, and eating instructions you receive. This guide cannot tell you whether to train on a particular day; your surgical team can.

Make prehab part of practical preparation

Exercise is one part of getting ready. Use the free home prep checklist to think through safer walking paths, the bathroom, and essentials for the first days home. For the recovery context after surgery, see the knee replacement recovery timeline. A short, repeatable plan is often easier to keep than a complicated routine that competes with appointments and everyday life.

The bottom line

Knee replacement prehab is a cautious way to practice mobility, strength, balance, and optional low-impact conditioning before surgery. Research suggests it may be useful for some early outcomes, but the evidence is not uniform and no six-week template can account for your symptoms or surgical plan (AHRQ review; JOSPT review). Keep the routine simple, progress gradually, and let your surgical team's instructions lead.

Disclaimer. This article is general education, not personalized medical advice, and it does not create a clinician–patient relationship. It is written by a future doctor training in orthopedic surgery and certified personal trainer. Nothing here is a prediction or promise about your surgery or recovery. Talk with your surgical team before acting on anything you read here. Questions about this article: support@jointprep.com. JointPrep is a product of Finding Well LLC.