How to Prepare for ACL Surgery: An Athlete's Prehab Game Plan
You've torn your ACL. You've got a surgery date. And somewhere between the shock and the paperwork, someone probably told you to "rest up before the op."
Here's the thing most athletes only realise afterwards: the weeks before ACL surgery are some of the most valuable in the whole recovery and most people waste them worrying instead of preparing.
This is your athlete's guide to preparing for ACL surgery: what to do, what to buy, and how to set yourself up so your first weeks of rehab are smooth, not brutal. Not generic patient advice a game plan built for someone who wants to get back to their sport, not just walk pain-free.
Why the weeks before ACL surgery matter more than you think
In ACL rehab, early problems become late problems. The state your knee is in when you walk into theatre is roughly the state it walks out in. A stiff, swollen, switched-off knee going into surgery is a stiff, swollen, switched-off knee coming out — and you'll spend months clawing back ground you could have banked beforehand.
This isn't just coach's opinion. Research on pre-operative rehab ("prehab") has shown that athletes who prepared their knee before ACL reconstruction had better outcomes two years down the line, including a greater likelihood of returning to their pre-injury level of sport, than those who only rehabbed afterwards.
Same surgeon. Same operation. Completely different start line.
The goal of good ACL prehab is simple: go in straight, go in calm, go in strong, and go in with a plan.
How long should you prehab before ACL surgery?
If you've got the time, two to six weeks of focused preparation makes a real difference. You don't need to live in the gym, most people do well with structured work around 3–4 times a week, plus daily little-and-often movement to keep the knee straight and the quad awake.
If your surgery is sooner than that, don't panic. Even one to two weeks of the right prep beats none. It's about turning up better than you otherwise would.
(Always clear any pre-op exercise with your surgeon or physio first every knee and every surgery is different.)
The 6 things to do before ACL surgery
1. Get it straight. Full knee extension is the single most stubborn thing to win back after surgery, and how straight your knee is early strongly predicts where it ends up. Chase it now with heel props, extension holds and prone hangs, little and often.
2. Calm it down. A swollen knee physically switches your quad off, and you can't train well through an angry joint. Use elevation, compression and cold to take the heat out before you add the trauma of surgery.
3. Keep the quad awake. After an ACL injury the body quietly shuts the quad down. If it's already asleep on surgery day, it's a long road back. Quad sets, straight-leg raises and inner-range holds keep the lines open.
4. Go in strong. The stronger the leg going in, the less you lose and the faster you rebuild. Pre-op strength is one of the best predictors of how well an athlete comes out the other side. Leg press, squats and step-ups to tolerance, plus hamstring and calf work.
5. Know your graft. Whether your new ACL comes from your own tissue (autograft; hamstring, patellar or quad tendon) or a donor (allograft) changes your early rehab. Ask your surgeon which you're having and why, so your plan is built around it.
6. Set up and get a plan. Sort your home and kit now (more below), and most importantly, have a structured rehab plan ready to start from day one, not "see how it feels."
What to buy before ACL surgery
You don't need to spend a fortune, but the right kit makes the early weeks far easier. Here's what's genuinely worth having.
Swelling and comfort
Reusable ice packs (buy two so one's always in the freezer)
A compression wrap or sleeve
A TENS machine for drug-free pain relief
Plenty of cushions or pillows for daytime leg elevation
Rehab tools
Mini bands and resistance bands for early strength work
Access to a gym for the later strength stages
A tape measure track swelling and thigh/calf size so you can actually see muscle loss and growth
Around the house
A shower stool and a waterproof leg cover to keep dressings dry
A bed tray for early rehab and meals
Crutch handle cushions to save your hands
Extra-long charging cables (you won't be moving far)
A phone tripod to film your exercises check your own form and share it with your coach
Toys for the dog you won't be walking them as normal for a while
Optional extras (if budget allows)
Game Ready or similar (hire it): combines cold and active compression. Superb for early swelling. You only need it for a few weeks, so renting is usually the smart play.
Muscle stim (EMS/NMES): wakes the quads up early when they don't want to fire. It can genuinely shave weeks off recovery.
Blood Flow Restriction (BFR): helps protect and build muscle when you can't lift heavy, but it's not a DIY tool. Only use it under the guidance of a trained professional.
(These are product types, not paid endorsements shop around, and clear any device like TENS, EMS or BFR with your Rehab team first.)
Your ACL hospital bag
Pack this the night before: comfy loose shorts or joggers that fit over a bulky knee, earphones, a book or Kindle, extra-long charging cables, spare pants and socks, easy slip-on shoes, your favourite snacks, any medications in their original packaging, toothbrush and toothpaste, deodorant, and your phone, wallet and paperwork.
Prepare your head, not just your knee
ACL recovery is as much mental as physical. Before surgery, write a quick mental checklist, the challenges you expect (boredom, frustration, bad days) and one way to handle each. Get your space ready: a cosy, reachable spot with everything to hand, a playlist you love, and meals cooked and frozen so you just defrost and eat. And bring your people in, tell family and friends what the timeline looks like and exactly what help you'll need in those first few days.
The biggest mistake: waiting until after surgery to get a plan
Here's where so many athletes come unstuck. They do the operation, get handed a sheet of exercises and a follow-up in six weeks, and are left to guess the rest. It's the same story I hear again and again including from athletes who've since returned to their sport with structured coaching after a generic plan left them short.
Walking pain-free is not the same as being ready to sprint, cut and compete. That gap — from "recovered" to "return to sport" — is exactly what a proper plan is built to close, and the best time to put it in place is before surgery, not months after.
Free download: the Before the Knife pre-op ACL guide
I've put everything above into a free, printable guide — the six pre-op missions, the full kit list, a hospital-bag checklist and the "green light" to aim for on surgery day.
Download the free Before the Knife guide → (add opt-in link)
Work with me
I'm Josh — a sports therapist and S&C coach, and I coach athletes through ACL rehab and back to their sport, in person in Swindon and online wherever you are. If you've got surgery coming up, or you're weighing up the decision, the best time to build your plan is now.
Learn about the Injury Rehab Clinic or online coaching
Frequently asked questions
Should you do physio or prehab before ACL surgery? Yes, where your surgeon allows it. Preparing the knee before surgery, getting it straight, settling swelling, keeping the quad active and building strength, is linked to better long-term outcomes and a smoother early recovery.
How long should you prehab before ACL surgery? Two to six weeks is ideal, training around 3–4 times a week with daily mobility work. If your date is sooner, even a week or two of the right prep helps.
What should I buy before ACL surgery? The essentials are ice packs, a compression wrap, a TENS machine, elevation cushions, resistance bands, a tape measure, and home aids like a shower stool and waterproof leg cover. If budget allows, a hired Game Ready unit and a muscle stim machine are excellent extras.
Does prehab actually improve ACL recovery? Research suggests athletes who prepare before surgery tend to have better knee function and a higher chance of returning to their pre-injury sport two years on, compared with rehab after surgery alone.
What exercises should I do before ACL reconstruction? Focus on regaining full knee extension, controlling swelling, activating the quad (quad sets, straight-leg raises) and building strength (leg press, squats and step-ups to tolerance) all cleared with your surgeon or physio.
Josh Ricketts is a qualified sports therapist and strength & conditioning coach based in Swindon, working with athletes from grassroots to international level across rugby, American football, athletics and more. This article is general educational information and does not replace advice from your surgeon or physiotherapist.