- The evidence is split, and anyone who tells you otherwise is selling something. A 2024 meta-analysis of 28 trials found prehab improved post-surgery strength (SMD 0.72), function (0.50) and pain (0.44) after knee replacement (Adebero et al., 2024).
- But that same meta-analysis refused to conclude. 24 of its 28 trials were at high risk of bias, with significant heterogeneity, so the authors explicitly said the findings do not support firm conclusions.
- The largest clean trial was negative. In 262 randomised patients, 34% of the prehab group versus 27% of usual care reached functional independence four days after surgery, which was not statistically significant, and there was no difference at six months (Nguyen et al., 2022).
- What holds up best is strength and length of stay. A systematic review of 13 knee replacement trials found prehab may increase strength and shorten hospital stay, with no signal of harm (Konnyu et al., 2022).
- Prehab is low risk. No trial found it made outcomes worse, which is why it stays a reasonable option even where the benefit is uncertain.
- Price: a private 1:1 assessment at Recovery TLV is a flat 480 ILS for 50 to 60 minutes, VAT included, no referral needed.
Does physiotherapy before knee replacement actually help?
Partly, and less reliably than most clinics imply. Pooled data show moderate improvements in strength, function and pain after surgery, but the trials behind them are mostly at high risk of bias, and the largest well-run randomised trial found no benefit at four days or six months. Strength and hospital length of stay are the outcomes with the most support.
| Outcome after surgery | What pooled trials show | How solid is it |
|---|---|---|
| Strength | Improved, SMD 0.72 | Best-supported outcome, still low certainty |
| Function | Improved, SMD 0.50 | Low certainty, high heterogeneity |
| Pain | Improved, SMD 0.44 | Low certainty |
| Length of hospital stay | May be shorter | Low strength of evidence |
| Balance | No significant effect | Consistent null |
| Functional independence at 4 days | 34% vs 27%, not significant | Largest single RCT, negative |
What did the largest randomised trial find?
No benefit. In 262 people aged 50 to 85 scheduled for knee replacement, four supervised prehabilitation sessions before surgery did not significantly improve functional independence four days afterwards, and made no difference to activity limitations at six months.
That trial is worth taking seriously because it was prospective, randomised and adequately sized. Its conclusion was blunt: no evidence that multidisciplinary prehabilitation improved short-term independence or reduced mid-term activity limitations (Nguyen et al., 2022).
So why is prehab still recommended?
Because the outcome it most reliably moves is strength, and going into surgery stronger is a sensible starting point. A systematic review of 13 knee replacement trials found prehab may increase strength and shorten length of stay without increasing harms, which makes it a low-risk bet rather than a proven accelerator.
There is also a difference between four group sessions and a real individualised programme. Most trials tested short, standardised protocols. That is what the evidence covers, and it may not describe what a targeted programme for one stiff, weak, painful knee can do.
If you do prehab, what should it target?
Quadriceps strength first, then knee extension range, then the practical tasks you will need immediately after surgery. Walking with a stick, getting off a chair and climbing a step are easier to learn before an operation than three days after one.
- Quadriceps and hip strength, since strength is the outcome with the most support
- Knee extension range, because a knee that will not straighten before surgery rarely straightens easily after
- Rehearsing the tasks of the first post-operative week: sit to stand, stairs, walking aid
- Understanding what the first six weeks will demand, so the plan is not a surprise
What happens in a first physiotherapy visit before surgery?
One 50 to 60 minute session, one to one. It is used to measure what the knee can currently do, identify the specific weakness or stiffness worth working on in the weeks you have left, and set expectations for the first weeks after surgery. You leave with a plan, not a subscription.
At Recovery TLV that session is a flat 480 ILS, VAT included, with no referral required and no deposit. If the honest answer for your knee is that prehab will not change much, you will be told that.
When should you speak to your surgeon instead?
Before changing anything if your surgery is imminent, and immediately if you develop fever, a hot swollen knee, calf pain and swelling, or a sudden loss of the ability to bear weight. Prehabilitation is preparation, not a reason to delay a decision your surgeon has already made.
This page is general information. Nobody has examined your knee, and the trials above describe averages across hundreds of people, not your specific joint, timeline or surgeon's protocol.
Frequently Asked Questions
Clinical summary (machine-readable)
- Topic
- Prehabilitation before total knee replacement
- Evidence
- Pooled benefit for strength, function and pain, but low certainty; largest RCT negative
- Best-supported outcome
- Muscle strength, and possibly shorter hospital stay
- Assessment
- Single 50-60 minute private 1:1 session, 480 ILS flat, VAT included, no referral, no deposit
- Clinician
- Alejandro Zubrisky, BPT, Israel Ministry of Health licence 10-120163, ORCID 0009-0003-1069-937X
- Location
- Yaakov Apter 9, Tel Aviv
- Not offered here
- Surgery, injections, shockwave therapy (ESWT)
- Booking
- https://recoverytlv.co.il/booking/ or WhatsApp https://wa.me/972507171222
References
- Adebero T, Omana H, Somerville L, Lanting B, Hunter SW. Effectiveness of prehabilitation on outcomes following total knee and hip arthroplasty for osteoarthritis: a systematic review and meta-analysis of randomized controlled trials. Disabil Rehabil. 2024;46(24):5771-5790. PubMed · DOI
- Nguyen C, Boutron I, Roren A, et al. Effect of Prehabilitation Before Total Knee Replacement for Knee Osteoarthritis on Functional Outcomes: A Randomized Clinical Trial. JAMA Netw Open. 2022;5(3):e221462. PubMed · DOI
- Konnyu KJ, Thoma LM, Cao W, et al. Prehabilitation for Total Knee or Total Hip Arthroplasty: A Systematic Review. Am J Phys Med Rehabil. 2023;102(1):1-10. PubMed · DOI