Mistakes before knee replacement surgery often come from reasonable attempts to protect yourself. You may rest because movement hurts, wait for pain to improve before exercising, or assume that physical therapy will address everything after surgery.
Preparation does not require perfect fitness or an aggressive program. It means using the time available to maintain useful movement, build capacity when appropriate, understand what lies ahead, and organize practical support.
Mistake 1: Resting too much before surgery
Pain can make rest feel like the safest choice. Although rest is appropriate at times, withdrawing from nearly all activity can reduce strength, endurance, balance, and confidence before surgery.
Preparation is not all or nothing. A manageable plan completed consistently is more useful than an ambitious plan you cannot tolerate.
A systematic review found that structured prehabilitation improved knee function before knee replacement and provided some benefits during the first months afterward.1 This does not mean everyone needs an intense program. Short walks, seated movement, and therapist-selected strengthening may all contribute when matched to your abilities.
Mistake 2: Waiting for pain to disappear
People sometimes postpone activity until their knee feels substantially better. With advanced osteoarthritis, that day may not arrive before surgery.
Appropriately selected exercise does not appear to accelerate joint damage. Research examining cartilage and inflammatory biomarkers found no evidence that therapeutic exercise harmed arthritic knee joints.2 The appropriate exercise dose still depends on your symptoms, health, and response.
Your surgeon or physical therapist can help you identify activities that allow you to prepare without repeatedly provoking your symptoms.
Mistake 3: Preparing without a complete plan
Prehabilitation is more than collecting exercises from different sources. It may include assessing strength, walking, balance, range of motion, endurance, home safety, medical readiness, and the support you will have after surgery.
The Knee Replacement Game Plan is my comprehensive prehab book for people who want to understand their starting point and prepare more deliberately. It brings the major pieces together in one evidence-informed system, including functional assessments, prehabilitation principles, home readiness, lifestyle factors, and final pre-surgery preparation.
The book is almost finished but has not been published yet. Visit the book page now to learn what it contains and sign up to be notified when it becomes available.
Mistake 4: Focusing only on your painful knee
Knee replacement changes one joint, but movement depends on your entire body. Your other leg, hips, ankles, trunk, balance, arms, and cardiovascular capacity contribute when you stand, walk with an assistive device, climb stairs, and get out of a chair.
A physical therapist can identify which areas need attention and select an appropriate starting level. More resistance and more repetitions are not automatically better.
As an Amazon Associate I earn from qualifying purchases.
Resistance bands with several resistance levels can support therapist-selected exercises for your hips and legs. The different levels allow the resistance to be adjusted without purchasing several separate sets. Use the resistance and exercises recommended for you.
Mistake 5: Ignoring endurance
Strength is only one part of physical preparation. After surgery, everyday tasks may require more energy because walking is slower, transfers require concentration, and your body is responding to a major procedure.
If your healthcare team approves, low-impact activity may help you maintain some cardiovascular capacity. This could include brief walking, water exercise, or cycling.
A compact pedal cycle with magnetic resistance provides a seated option for some people. The magnetic resistance offers smoother adjustment than many basic friction models. It is only appropriate if your knee tolerates the required bending and your healthcare professional agrees that cycling fits your plan.
Mistake 6: Expecting predictable daily improvement
Some people enter surgery expecting pain and swelling to decrease each day. Symptoms often fluctuate instead. Sleep, activity, swelling, medication timing, stress, and individual physiology can produce noticeable changes from one day to another.
Functional improvement also develops over a longer period than many people expect. A longitudinal systematic review found that self-reported function improved most clearly between three and six months, while performance-based measures followed varied patterns.3
Understanding that variability before surgery can prevent one uncomfortable day from becoming the standard by which you judge the entire experience.
Mistake 7: Treating physical therapy as something done to you
Physical therapy includes assessment, education, progression, problem-solving, and movement practice. Appointments provide guidance, but much of the process occurs between visits.
Quadriceps activation can decline sharply after knee replacement because of both muscle loss and difficulty fully activating the muscle.4 Understanding this beforehand helps explain why early exercises may look simple while still requiring focused effort.
Large-scale research has also found better outcomes after implementation of a structured physical therapy care guideline.5,6 A coordinated plan is more useful than accumulating unrelated exercises.
For continuing education before and after surgery, be a Total Knee Success Insider. You will receive new episodes and resources relevant to your stage of the knee replacement process.
Mistake 8: Leaving practical planning until the last minute
Exercise cannot compensate for an unsafe walking path, missing transportation, unclear medication instructions, or a lack of help at home.
If surgery is within two weeks, use the free 2-Week Knee Replacement Launch Plan. It organizes practical preparation for two weeks before surgery, one week before, three days before, the night before, and surgery day.
Confirm transportation, meals, equipment, support, follow-up appointments, and physical therapy. Review medication, fasting, and skin-preparation instructions directly with your surgical team.
Use the time you have
If surgery is months away, you may have time to build strength and endurance gradually. If it is two weeks away, shift toward maintaining your capacity and completing practical preparations. If it is tomorrow, follow your surgical instructions rather than trying to squeeze an entire prehab program into one evening.
Episode 30 discusses sleep positions after knee replacement, including back sleeping, side sleeping, recliner use, and why no single position works for everyone.
Join the free Total Knee Success Insider for practical knee replacement education, new podcast episodes, and helpful resources. You can also sign up using the form at the bottom of this page.
This article provides general educational information. It does not prescribe an exercise program, diagnose a condition, replace an examination, or establish a physical therapist-patient relationship. Follow your surgeon’s instructions and work with an appropriate healthcare professional when selecting activities before surgery.
References
- Gränicher P, Franchi F, Gokeler A, et al. Prehabilitation improves knee functioning before and within the first year after total knee arthroplasty: a systematic review with meta-analysis. J Orthop Sports Phys Ther. 2022;52(11):709-725. doi:10.2519/jospt.2022.11160
- Bricca A, Juhl CB, Steultjens M, et al. Impact of exercise therapy on molecular biomarkers related to cartilage and inflammation in people at risk of, or with established, knee osteoarthritis: a systematic review and meta-analysis of randomized controlled trials. Arthritis Care Res (Hoboken). 2019;71(11):1504-1515. doi:10.1002/acr.23786
- Orange GM, Hince DA, Travers MJ, et al. Physical function following total knee arthroplasty for osteoarthritis: a longitudinal systematic review with meta-analysis. J Orthop Sports Phys Ther. 2025;55(1):1-11. doi:10.2519/jospt.2024.12570
- Mizner RL, Petterson SC, Stevens JE, Vandenborne K, Snyder-Mackler L. Early quadriceps strength loss after total knee arthroplasty: the contributions of muscle atrophy and failure of voluntary muscle activation. J Bone Joint Surg Am. 2005;87(5):1047-1053. doi:10.2106/JBJS.D.01992
- Minick KI, Hunter SJ, Capin JJ, et al. Improved outcomes following a care guideline implementation: part 1 of an analysis of 12,355 patients after total knee arthroplasty. J Orthop Sports Phys Ther. 2023;53(3):143-150. doi:10.2519/jospt.2022.11369
- Capin JJ, Minick KI, Stevens-Lapsley JE, et al. Variation in outcomes and number of visits following care guideline implementation: part 2 of an analysis of 12,355 patients after total knee arthroplasty. J Orthop Sports Phys Ther. 2023;53(3):151-158. doi:10.2519/jospt.2022.11370
- Na A, Coronado RA, Blanck CR, et al. Diabetes mellitus blunts the functional and quality-of-life benefits of total knee arthroplasty. J Orthop Sports Phys Ther. 2021;51(6):269-280.