Knee replacement and ACL surgery
Pain relief after knee replacement and ACL surgery
The first weeks after knee surgery are the hardest. Your surgeon manages your medicines and your physio guides your exercises. VibraCool is a wearable vibration and cold device you can use at home alongside both, for drug-free pain relief.
Your recovery plan
How do you use VibraCool before and after knee surgery?
Here is when to use VibraCool at each stage, why it helps and what to do. It follows the knee surgery pain plan from Pain Care Labs, the US company that makes VibraCool. Your surgeon's instructions always come first.
1Before surgery
The 2 to 4 weeks before your operation
Why it helps
Pre-hab exercises build the thigh muscles that support your knee after surgery. A sore knee can make them hard to do, and Pain Care Labs suggests VibraCool for pre-hab pain. Learning to fit it now also means you are not working out straps on day one. In the Columbia University trial, patients were shown how to use it before surgery.
What to do
- Use it for 20 minutes before or after your pre-hab exercises
- Practise strapping it on so you know the fit
- Tell your surgeon and physio you plan to use it
- Freeze both ice packs the night before surgery
2The first days home
From when your nerve block wears off
Why it helps
Pain is usually strongest in the first days. Cold eases pain and swelling, and vibration adds a second signal that competes with pain. In a small, unpublished pilot, ACL patients who used VibraCool from the day of surgery took 35% fewer opioid tablets in the first week than a comparison group.
What to do
- Start once your surgeon agrees and feeling has come back after the nerve block
- Place it on the skin just above where your dressing ends
- Use it with the ice pack for 20 minutes, as often as every 2 hours
- Keep your leg raised while you use it, if your surgeon has advised this
3The rehab weeks
Once your physio exercises start
Why it helps
Sore, stiff muscles are a common reason people fall behind on their exercises. VibraCool is FDA cleared for use before or during physio, to ease muscle pain and tightness. Less pain makes it easier to keep up with your physio plan.
What to do
- Before exercises, use vibration alone or with a hot pack for 5 to 10 minutes to warm stiff muscles
- After exercises, use vibration with the ice pack for 20 minutes
- Use heat with vibration for sore thigh muscles or a tight IT band
- Keep going 2 to 3 times a day until the pain settles
Placement
Where do you put VibraCool after knee surgery?
Put VibraCool on the skin just above where your dressing ends, on the thigh side of your knee. Never put it on the wound or the dressing.
It does not need to touch the wound to help. Vibration and cold travel along the same nerves that carry pain from your knee, and studies show vibration eases pain in nearby areas, not only the spot it touches.
- Slide it a little up or down until you feel the most relief
- Once your wound has closed and your surgeon agrees, place it directly over the sorest spot
- Face the smooth blue side of the ice pack to your skin for stronger cold. Turn it to the soft white side if it feels too cold
- Ask your physio to check the spot at your first post-op visit
Each session
How long should you use VibraCool after knee surgery?
Use it for 20 minutes at a time with the ice pack. Pain Care Labs suggests up to every 2 hours in the first days, then 2 to 3 times a day during rehab. Vibration on its own can be used for as long as you like.
Step by step
- Freeze the ice packs solid. Soft, squishy packs soak up the vibration
- Fit the ice pack under the unit and strap it in place
- Press the button. It runs for 10 minutes, then switches off. Press it again for a full 20 minutes
- Take it off after 20 minutes, which is about how long the ice pack stays frozen
- Put the pack back in the freezer for your next session
When not to use it
- On the wound, broken skin or a rash
- If you have calf pain you cannot explain. After surgery this can be a sign of a blood clot, so call your surgeon or GP straight away
- With the ice pack while your leg is still numb from the nerve block, because you cannot feel if it is too cold
- With the ice pack if you are sensitive to cold, for example with Raynaud's or CRPS. Use vibration on its own instead
How it works
How does VibraCool ease knee pain without medicine?
A small motor vibrates quickly while a frozen ice pack cools the area. Both send signals that compete with pain signals, so less pain gets through. No pads, no electrical current, no medicine.
The right model
Which VibraCool is for knee surgery recovery?
VibraCool Extended for knee and ankle
The model Pain Care Labs recommends in its knee surgery pain plan. The long strap wraps around the knee or thigh and holds a large reusable ice pack. It also fits the ankle and calf.
Shop VibraCool ExtendedCommon questions
Knee replacement and ACL recovery: your questions answered
Knee replacement surgery works through bone, muscle and soft tissue, so strong pain in the first weeks is expected. The American Association of Hip and Knee Surgeons recommends combining pain medicines with ice and elevation. Your surgeon sets your medicine plan. At home, ice for 20 to 30 minutes at a time, raising your leg above heart level and the exercises your physio gives you all help. VibraCool adds vibration to cold in one wearable strap.
Pain is strongest in the first weeks and eases as your knee recovers. The NHS says full recovery can take several months or longer, and most people return to work after about 6 to 12 weeks. If your pain gets worse instead of better, or comes with redness, heat or fever, call your surgeon.
Ice and elevation are the standard home measures for swelling after knee replacement. The American Association of Hip and Knee Surgeons suggests ice for 20 to 30 minutes, then off for 30 minutes before reapplying, with a towel between the ice and your skin. Your surgeon will tell you how many weeks to keep going. A VibraCool session is 20 minutes with its own ice pack, so it fits the same routine.
Most people use a mix. Your surgeon manages your medicines. Alongside them, ice, compression, elevation, gentle movement and physio all help. VibraCool is a drug-free option you can add at home. It combines vibration with an ice pack. In a trial where the same patients tried both, they rated it up to 3.4 times more effective than a TENS machine.
Ice machines and cryo cuffs pump cold water around the knee and are often hired for the first weeks after surgery. They are one option, not the only one. Ice packs, elevation and your physio exercises are the standard home measures. VibraCool is a smaller wearable that adds vibration to an ice pack, with no tank or pump. Use whichever your surgeon allows.
Check with your surgeon first. TENS pads have to sit on healthy, unbroken skin, which limits where they can go around a fresh wound and dressing. VibraCool uses no pads and no electrical current. It sits on the skin just above the dressing, with an ice pack. In a Columbia University pilot, ACL patients started using it on the day of surgery.
Use ice in the first days, when pain and swelling are highest. Pain Care Labs suggests heat with vibration later on, for sore thigh muscles, a tight IT band or stiff muscles before your exercises. Use ice after exercises. Follow what your surgeon and physio tell you for your knee.
Your surgeon and physio will give you a plan, which usually includes pre-hab exercises to strengthen your leg. Pain Care Labs suggests starting leg strengthening about a month before, planning your pain relief options with your doctor, and having your home ready. If you plan to use VibraCool, practise fitting it before surgery and freeze the ice packs the night before.
Yes, if your surgeon agrees. Pain Care Labs suggests starting when your nerve block wears off and feeling returns. In a Columbia University pilot, ACL patients used it from the day of surgery, 20 minutes, three times a day. Place it on the skin just above your dressing, never on the wound.
After surgery, place it on the skin just above where your dressing ends, on the thigh side of the knee. Slide it up or down until you feel the most relief. Once the wound has closed and your surgeon agrees, you can place it directly over the sorest spot. The full steps are on how to use VibraCool.
Are you a physiotherapist? See VibraCool for physiotherapists for clinic pricing and demo units.
Last updated September 2026 by Buzzy4Shots, official Australian and New Zealand distributor of VibraCool. This page is general information, not medical advice.
References
- American Association of Hip and Knee Surgeons. How to Relieve Pain After Knee Surgery. hipkneeinfo.org.
- NHS. Recovering from a knee replacement. nhs.uk.
- Marovino T, Baxter A. Vibration and cold vs TENS crossover trial. American Academy of Physical Medicine and Rehabilitation, 2019.
- Baxter A, et al. Frontiers in Pain Research, 2023. NIH HEAL Initiative.
- Effects of focal vibration on pain and opioid usage following ACL reconstruction: a pilot study. 2019. Unpublished, summarised in the Pain Care Labs VibraCool Literature Review, 2024.
- Columbia University Irving Medical Center. VibraCool after ACL reconstruction. ClinicalTrials.gov NCT06456268.
- Pain Care Labs. Opioid-Free Post-Op Plan for Knee Surgery. paincarelabs.com.
- Pain Care Labs. VibraCool instructions for use and FDA 510(k) indications for use.
- Yarnitsky D, et al. Vibration reduces thermal pain in adjacent dermatomes. Pain, 1997.