Hit Your Knee Flexion Goals Faster With Less Pain After Knee Replacement Within 16 Weeks.

The 20-minute red light therapy session — used before and after PT — that's helping post-TKR patients to hit their flexion goals faster and ease PT pain.

Feel meaningful progress and relief in 120 days, or send it back — we'll refund every cent, including shipping.

Less swelling after PT, so you're not "recovering for 2 days" before the next session

Get through the night. Use it in the evening when the ache is worst

Walk into PT looser, not braced for the worst

Ease the tightness that makes every degree of bend a fight

Try redrelief™ RISK FREE - $89.99

3,200+ 4.4-Star Reviews

Your Knee Is Healing In A Hostile Environment Making Progress Slow.

You're healing in a hostile environment. The good news: you can calm the swelling, protect your progress, and make PT tolerable again, without reaching for more pills.

You expected some discomfort. You didn't expect this. A knee that feels like it might tear when you bend it.

Sessions that leave you shaking, sore for days, dreading the next appointment.

The constant worry that pushing too hard will set you back—or not pushing hard enough will slow you down.

And sometimes a therapist who doesn't seem to hear you when the pain gets to be too much.

If physical therapy feels more traumatic than therapeutic, you're not alone.

And you're not weak.

Here's why it hurts so much: after surgery, your knee isn't just healing—it's swollen.

PT forces movement into tissue that's swollen, starved of oxygen, and already firing pain signals to protect itself.

That sets off a vicious cycle. Pain limits movement. Limited movement causes stiffness. Stiffness makes the next session even more painful. And pain leads to more medication—or skipped appointments.

The pain isn't proof you're doing it right, and it isn't proof you're weak. A swollen knee fights every bend. Calm the swelling, and PT stops feeling like a battle.

That's why more people recovering from knee surgery are adding red light therapy to their routine—not to replace physical therapy, but to make it survivable, effective, and faster.

Used between sessions, it helps reduce deep inflammation, improve circulation to the healing tissue, and calm pain signals before your next appointment.

Loosen Before PT, Clear the Swelling After.

A short 20-minute session can completely change how PT feels—and how quickly you recover.

20 minutes BEFORE physical therapy:

Warms and loosens stiff, guarded tissue so your knee moves more freely
Increases blood flow so muscles and joints are better prepared for movement
Calms pain signals in advance, so exercises don't feel as sharp
Helps you reach greater range of motion with less resistance
Reduces the "bracing" reflex that makes every bend feel like a battle

20 minutes AFTER physical therapy:

Cools down the swelling PT stirs up before it snowballs
Speeds up recovery so you're not sore for days afterward
Flushes out waste products from stressed tissue
Supports overnight healing so you wake up looser, not stiffer
Cuts down on the "day-after crash" that leaves you dreading the next session

Used this way—before and after each appointment—red light and infrared therapy doesn't replace your PT.

It makes it survivable, more effective, and far less painful. That's why a growing number of post-surgical patients are adding RedRelief to their recovery routine: same PT, less suffering, faster progress.

Hit Your Knee Flexion Goals Quicker With Less Pain.

Here's something most patients don't realize: your cells are capable of healing much faster and more efficiently than they typically do after surgery.

The bottleneck isn't your body's potential—it's the environment you're giving your cells to work with.

Deep inside your surgical site, your body is working overtime. Tiny structures called mitochondria (the "power plants" inside every cell) are producing energy to fuel repair.

Special cells are laying down new tissue. Blood vessels are trying to deliver oxygen and nutrients to the area. But when inflammation is high and circulation is poor, all of this runs at half-speed.

It's like asking a construction crew to build a house in the dark with half the materials—the job still gets done, but it takes twice as long, and the results aren't as strong.

To turn that around, three things need to happen at the cellular level:

PENETRATE — The light has to actually reach the healing tissue. Near-infrared wavelengths (810–850nm) pass through skin and muscle to where the repair is happening.
ENERGIZE — Once there, that light is absorbed by the mitochondria, giving your cells the extra energy they need to rebuild.
CALM — Excess inflammation gets quieted, circulation improves, and nutrients can finally flow freely to the repair site.

Miss even one of these, and your cells stay stuck at half-speed.

That's why heat alone falls short (surface warmth only, no cellular boost).

Why massage alone falls short (can't reach the deep repair site).

Why rest alone falls short (no circulation boost, no energy boost). You need all three—at the same time, from a single source.

How Does RedRelief™ Help Post Op Knee Recovery?

Red light and infrared therapy has shown promise as a gentle, non-invasive option for easing post op pain, discomfort and boosting knee recovery post op knee replacement surgery.

Less swelling

Red light therapy (also called photobiomodulation) targets swelling by changing how your cells produce energy, manage oxidative stress, and regulate swelling. Think of it less like a “heat treatment” and more like a cellular signaling therapy.

Stimulates your body’s natural healing response

Red light therapy stimulates your body’s natural healing response by activating the same cellular repair pathways your body uses after injury — just faster and more efficiently.

Backed by thousands of studies

15+ years of research done on red light therapy. Several hundreds of clinical studies, research, papers and journals.

Safe, non-invasive, and side-effect free

Safe, non-invasive, and largely side-effect free because it uses low-energy light to stimulate biological processes — without damaging tissue, breaking skin, or introducing drugs into the body.

What Our Customers Are Saying?

Margaret T., 66

Flexion progress:
Week 1: 65° → Week 4: 110° → Week 8: 138° ✓

"I was skeptical — I've tried every gadget my daughter has sent me. But I was desperate. I used RedRelief 20 minutes before PT and 20 minutes after. By week two the swelling was down enough that I stopped the heavy pain meds. My PT was shocked at week six when I hit 130. I'm ahead of every milestone my surgeon set for me."

David L., 72 — 3rd Knee Surgery

"I've done this recovery twice before, so I know what a bad one feels like. This was the easiest of the three by a mile. If you're facing this surgery, don't do it without this. That's my honest opinion after three knee surgeries."

Susan K., 58

"I cried after my first three PT appointments. I'm not exaggerating — I told my husband I couldn't do it anymore. My daughter-in-law found RedRelief and I was so skeptical, but at that point I would've tried anything. I started using it 20 minutes before PT to loosen the joint and 20 minutes after to calm the swelling. Within a week, PT stopped being torture. My therapist actually asked what I was doing differently. I hit 130 degrees at week 10 — my surgeon's goal was 120 by week 12."

Side by side

How RedRelief™ compares

Red light, near-infrared, heat and massage in one brace you can wear around the house.

Feature

Our pickRedRelief™

Compression knee sleeve

Plug-in heating pad

Red light660 nm LEDs

Yes

No

Near-infrared light850 nm LEDs

Yes

No

Soothing heatAdjustable settings

5 modes

No

Yes

Vibration massage

Yes

No

Some models

Cordless useRechargeable, no outlet needed

Yes

No power needed

No

Straps on hands-freeFits left or right knee

Yes

Some models

Risk-free returns

120 days

Varies

Warranty

2 years

Varies

Comparison with typical products in each category. Individual products vary.

Research Backed Clinical Studies and Results

Red light therapy isn't new age wellness nonsense. It's a clinically studied technology that's been used by professional athletes, military personnel, and now, smart post-surgical patients who refuse to accept months of suffering as inevitable.

Here's how it works:

When specific wavelengths of red and near-infrared light (typically 660nm and 850nm) penetrate your skin, they reach deep into your tissues—including muscles, tendons, ligaments, and even bone.

At the cellular level, these light wavelengths are absorbed by your mitochondria, triggering a cascade of beneficial biological responses:

More cellular energy. Red and near-infrared light are absorbed by the mitochondria, the parts of cells that produce energy (ATP). Researchers believe this helps cells in the tissue around the joint work more normally.
Calmer joint environment. Studies suggest light therapy can influence inflammatory signals, which is one reason it's being researched for joint discomfort.
Better local circulation. Light and gentle warmth increase blood flow around the knee, which helps it feel less stiff.
Less pain and stiffness. In clinical studies on knee arthritis, light therapy reduced pain and improved function compared with placebo.

The result? A knee that feels looser and less achy, so getting moving is easier.

Low-Level Laser and Light Therapy After Total Knee Arthroplasty (2022)

Shows that LLLT applied in the early recovery phase after total knee replacement can reduce acute pain and swelling, lower opioid use, and improve range of motion and functional scores.

Photobiomodulation Therapy (PBMT) Post-Operative Benefit Study (2022)

PBMT may reduce acute pain and inflammation after major joint surgery, though more targeted knee studies are needed.

Photobiomodulation Therapy on Postoperative Swelling and Mobility After TKA (2023)

Photobiomodulation (red light therapy) effectively reduces postoperative swelling and enhances early mobility, suggesting benefit as an adjunct in postoperative care.

Effect of Low-Level Laser Therapy on Knee Range of Motion and Functional Abilities After Total Knee Arthroplasty (2025)

Addition of LLLT to standard rehabilitation post-TKA resulted in significant improvements in knee flexion and functional outcomes compared to rehab alone.

Therapeutic Effects of Low-Level Laser Therapy After Total Knee Arthroplasty (2014)

Post-operative LLLT was associated with improved early postoperative pain control and greater active knee flexion and extension, suggesting beneficial effects on pain and knee function after TKA without significant side effects.

3,200+ 4.4-Star Reviews

POST-OP KNEE REPLACEMENT RECOVERY

RedRelief™ Infrared Red Light Therapy Knee Brace

$89.99

FREE BONUS

Bend Better, Sooner: Knee Flexion Recovery Guide

7 home exercises, a daily routine with your RedRelief sessions and a 12-week tracker. Emailed to you right after you order.

✓ RedRelief knee brace + USB-C charger
✓ Quick Start Therapy Guide
✓ FREE knee flexion recovery guide + 12-week tracker

Quantity

Free Economy Shipping Order today and it ships within 1–2 business days.

Ordered Today
Ships 1–2 business days
Delivered 5–8 business days

Dates shown are for free economy shipping on orders over $60. Need it sooner? Choose faster shipping at checkout. · 120-day risk-free returns

The Whole-Recovery Guarantee

Recovery doesn't happen in 30 days, so neither does our guarantee.

Use RedRelief before and after every PT session for 120 days, which covers your whole course of PT. If you don't feel it's making your recovery easier, send it back for a full refund.

Opened and used? Still covered. No "unopened box" rules.

Free returns. We email you a prepaid label. You don't pay to ship anything overseas.

Your PT says not yet? Send it back. Full refund.

Real people answer. Email us and hear back within 24 hours.

120 days to try it

Long enough to cover your whole PT program.

Use it at home

Wear it every day. No need to keep the box sealed.

Two-year warranty

Protected against covered product defects for two full years.

Here's What RedRelief Does For You

Recovering from a total or partial knee replacement?

Swelling, stiffness and PT sessions that leave you sore for days are normal after surgery, but they don't have to set your pace. RedRelief™ is built for the weeks after surgery: 20 minutes before PT to loosen the joint, 20 minutes after to calm the swelling.

The RedRelief™ Knee Brace uses clinically-backed red and infrared light therapy plus therapeutic heat to help your knee heal — safely, naturally, and from home. In just 20 minutes, twice a day, it works to:

Reduce inflammation and swelling in the knee joint so movement feels easier.
Boost circulation and oxygen flow to knee tissues to speed up healing.
Break down scar tissue and adhesion to restore flexibility in stiff knees.
Strengthen soft tissue (muscles, tendons) for smoother, pain-free movement.
Soothe irritated nerves for lasting pain relief.

This is the same technology trusted by physical therapists and pro athletes — now available for everyday recovery at home.

Compare it to the cost of multiple PT sessions or endless doctor visits. RedRelief™ is an investment in lasting relief. Every night you delay is another night of pain and broken sleep.

Is RedRelief™ Right for You?

Who It’s For

To hit knee flexion goals faster with less pain.
Anyone with sharp knee pain or limited mobility (difficulty walking, climbing stairs, etc.).
People tired of relying on painkillers or other therapies that failed to give relief.

Who It’s Not For

Pregnant women
Individuals undergoing active cancer treatment
Areas with open wounds (wait until healed or covered)
People with photosensitive conditions (sensitivity to light)

Product Specifications

Functions and settings

Vibration: 5 levels, F01–F05 (defaults to F01 on power-up; cycles F02 → F03 → F04 → F05 → OFF → F01)
Red light / heat modes (defaults to 660 nm):
- Mode 1: 660 nm, about 35–40 °C
- Mode 2: 850 nm, about 50–55 °C
- Mode 3: F10, about 40–45 °C
- Mode 4: ALL, about 55–60 °C
- OFF is also available
Timer: 15, 30 or 45 minutes (defaults to 15), with automatic shutdown when the time runs out
Screen lock: after you set it up, a brief press of the power button shows the battery level for 2 seconds, then the screen locks
Recommended use: a single session should be no longer than 15 minutes, and the manual recommends 15–30 minutes per day

Controller

Power/lock button, vibration button, red light mode button and timer button
Digital display showing minutes, wavelength (nm) and battery level
Button lock light and charging indicator light
The display shows "100%" when the battery is fully charged

Physical and care

Straps adjust in the order top → middle → bottom
Not waterproof
Do not machine wash, wring, tumble dry, iron or dry-clean. Wipe clean with a damp cloth.

Electrical

Working voltage: 5 V
Working current: 1520 mA
Battery capacity: 5000 mAh
Charging current: 2000 mA
Charging port: USB Type-C

What’s Included?

RedRelief™ Red Light & Infrared Knee Brace
USB Rechargeable Power Supply
Adjustable Knee Fit (Left or Right)
Quick Start Therapy Guide
💼 Backed by our 120 Day “Relief or Refund” Guarantee 🌐

Clinical Citations

Red light therapy for knee pain (1992). In a pioneering trial with older adults, just 10 days of red light treatments cut knee pain by over 50% and improved mobility.
Low-level laser therapy for knee osteoarthritis (2009). In a placebo-controlled study, 4 weeks of twice-weekly infrared laser therapy significantly reduced knee pain and even improved local circulation in the knee – changes not seen in the placebo group.
High-intensity vs low-level laser in knee rehab (2014). A clinical trial found adding laser therapy to exercise led to faster pain reduction and better knee function than exercise alone; even standard red light therapy outperformed exercise-only rehab in relieving pain and disability.
Laser therapy for knee arthritis – systematic review (2019). A review of clinical trials concluded that low-level laser therapy significantly decreases knee pain and disability in osteoarthritis, especially when applied at optimal therapeutic wavelengths and doses.

Over 15 years of research supports using red and infrared light therapy to treat knee pain and restore joint mobility.

One clinical study of 53 patients with knee osteoarthritis found that combining red light therapy with a rehab exercise program led to greater pain relief and functional improvement than exercise alone.

After 6 weeks, patients who received laser therapy plus exercise reported lower pain scores and better knee function, highlighting that adding red light therapy enhances standard treatment – helping to relieve knee pain and improve daily movement.