Most people with knee arthritis never need a new knee, and many who eventually do get years of decent function first. The catch is that the nonsurgical options are not equal. Some have strong evidence behind them, some have weak or mixed evidence, and a few are sold widely even though the main orthopedic guideline in the United States recommends against them.
This guide walks through what the American Academy of Orthopaedic Surgeons (AAOS) actually says about each option in its knee osteoarthritis guideline, how strong each recommendation is, and how long relief tends to last where research measures it. It complements our piece on whether it is time for knee replacement, which covers the decision itself.
The guideline behind this list
In September 2021 the AAOS published the third edition of its clinical practice guideline on managing knee osteoarthritis without joint replacement. It replaced the 2013 edition and was built with several partner groups, including the American Association of Hip and Knee Surgeons, The Knee Society and the American Academy of Family Physicians.2 The guideline contains 29 recommendations covering treatments less invasive than replacement.4
Each recommendation carries a strength rating. Here is what those labels mean in practice:
- Strong: high-quality evidence, consistent results. You can expect the treatment to help (or, for a negative recommendation, not to help) most people like those studied.
- Moderate: good evidence with some inconsistency or limitations.
- Limited: low-quality or conflicting evidence. The treatment "may" help, but the guideline is not confident.
- Downgrade: the workgroup lowered the rating one step, for example because study results were inconsistent.
The AAOS is explicit that these are guiding principles, not fixed rules, and that your surgeon's judgment about your knee should drive individual decisions.2
Knee arthritis treatments compared: evidence and relief
The table pulls the AAOS strength ratings together with what is known about how long relief lasts. Where the guideline or the studies we reviewed do not give a duration, we say so instead of guessing.
| Treatment | AAOS position and strength | Typical relief duration |
|---|---|---|
| Exercise (supervised, home or aquatic) | Recommended, strong3 | Lasts as long as you keep doing it |
| Self-management and patient education programs | Recommended, strong3 | Ongoing; skills you keep |
| Weight loss (if overweight) | Recommended, moderate1 | Ongoing while weight stays off |
| Oral NSAIDs | Recommended, strong, if not contraindicated3 | While you take them |
| Topical NSAIDs | Recommended, strong, if not contraindicated3 | While you use them |
| Acetaminophen | Recommended, strong, max 3,000 mg/day2 | While you take it |
| Corticosteroid injection | Could give short-term relief, moderate1 | Weeks; benefit uncertain by 3 months, none shown at 6 months5 |
| Hyaluronic acid (gel) injection | Not recommended for routine use, moderate1 | No reliable benefit per guideline |
| Platelet-rich plasma (PRP) | May help, limited1 | Not established; ask for the clinic's data |
| Denervation therapy (includes genicular nerve ablation) | May help, limited1 | Often about 6 months; reported range 3 to 12 months68 |
| Knee brace | Could help, moderate1 | While worn |
| Cane | Could help, moderate3 | While used |
| Lateral wedge insoles | Not recommended, strong3 | No benefit shown |
| Oral opioids, including tramadol | Not recommended, strong3 | Not effective, more side effects |
| Arthroscopic washout or debridement | Not recommended, moderate3 | No benefit for arthritis alone |
Exercise, physical therapy and weight loss come first
Exercise is one of the few knee arthritis treatments with a strong rating, and the guideline does not insist on one format. Supervised sessions with a physical therapist, a home program and pool-based exercise all count.3 The point is consistent strengthening and movement, not a particular gym.
Structured self-management and education programs also earned strong ratings.3 These teach pacing, flare management and how to keep moving without feeding the pain cycle. Neuromuscular training (balance, agility and coordination work) got a moderate rating, and manual therapy added to exercise got a limited one.3
For people who are overweight, sustained weight loss is recommended at moderate strength. The guideline notes that diet combined with exercise appears to work better than either alone.1 If you are considering weight-loss medication on the way to surgery, read our guide to GLP-1 medications before joint replacement, because those drugs raise their own anesthesia questions.
Strength and conditioning before a replacement makes the rehab afterward easier. Our prehab checklist lays out what to work on in the weeks before an operation.
Pain medications: NSAIDs yes, opioids no
Oral NSAIDs (such as ibuprofen or naproxen), topical NSAID gels and acetaminophen all carry strong recommendations, each with the caveat "when not contraindicated."3 That caveat is real. NSAIDs can be a problem for people with kidney disease, stomach ulcers, certain heart conditions or those on blood thinners, so check with your doctor before taking them regularly. The guideline caps acetaminophen at 3,000 mg a day.2
Topical NSAIDs are worth asking about if you cannot take pills, because less of the drug reaches the bloodstream. The guideline rates them strong for improving function and quality of life.3
Oral opioids, including tramadol, are a strong no. The guideline found they caused more adverse events without improving pain or function.3 If opioids are being offered as long-term knee arthritis management, that is a reason to get a second opinion.
Supplements such as turmeric, ginger extract, glucosamine, chondroitin and vitamin D received a limited, downgraded rating: they may help pain and function in mild to moderate arthritis, but the evidence is inconsistent.3
Knee injections: steroid, gel and PRP
Corticosteroid injections
The guideline says a steroid injection into the knee "could provide short-term relief," rated moderate.1 It does not put a number on "short-term." A 2015 Cochrane review of steroid injection trials found a moderate benefit one to two weeks after the shot, a small to moderate benefit at four to six weeks, a small and uncertain benefit at about three months, and no evidence of benefit at six months.5 The reviewers rated the evidence low quality and warned that the trials may overstate the true benefit.5 In plain terms: a steroid shot can calm a flare or get you through a trip, but it is not a long-term plan.
Ask your surgeon how many steroid injections they are comfortable giving and how close to surgery the last one can be. Surgeons set their own rules on how long to wait between an injection and a replacement, so get that interval from the surgeon who would operate.
Hyaluronic acid (viscosupplement or "gel" shots)
The 2021 guideline says hyaluronic acid is "not recommended for routine use," at moderate strength.1 This is not new. The 2013 edition also recommended against it, at strong strength.7 Gel injections are still widely offered, so if one is suggested, ask what makes your case an exception to the routine-use recommendation.
Platelet-rich plasma
PRP "may reduce pain and improve function," but only at limited strength, downgraded.1 PRP preparations differ between clinics in how the blood is spun and how many injections are given, which makes studies hard to compare. If you are paying cash for PRP, ask which preparation the clinic uses, how many injections the course includes and what results they track.
The AAOS evidence summary we reviewed does not rate stem cell or cell-based injections for knee arthritis.3 Be cautious with any clinic that promises to regrow cartilage. Ask for published results, not testimonials.
Genicular nerve radiofrequency ablation
Genicular nerve radiofrequency ablation uses heat to disable small sensory nerves around the knee so they stop sending pain signals. It does not change the arthritis itself. The AAOS guideline groups this kind of treatment under "denervation therapy" and says it "may reduce pain and improve function," rated limited and downgraded.1
A 2021 systematic review of fluoroscopically guided genicular nerve ablation, which included nine studies, found that between 49% and 74% of patients reported at least 50% pain relief at six months.6 In the comparative studies, ablation was more likely to succeed than a steroid or hyaluronic acid injection, and the reviewers graded the evidence as moderate quality for pain relief lasting at least six months.6 Longer-term results are less clear. A 2021 review in a Spanish pain journal described relief of variable duration, between three and twelve months, noted that techniques and targets are not yet standardized, and listed rare reported complications including a skin burn, a joint infection and a hematoma.8 The nerves can regrow, which is why relief often fades.
Questions to ask before ablation: whether the clinic does a diagnostic nerve block first, which technique it uses (conventional, cooled or pulsed), and what happens if relief fades. Ablation is usually done by pain medicine or interventional specialists rather than orthopedic surgeons.
Braces, canes, insoles and other devices
Knee braces got a moderate, downgraded rating: they could improve function, pain and quality of life. The downgrade came from inconsistent results across studies.1 If a brace is suggested, ask what type it is, what it is meant to do for your pattern of arthritis, and whether you can trial it before buying.
A cane is rated moderate.3 Held in the hand opposite the painful knee, it is one of the cheapest options on this list. Lateral wedge insoles, on the other hand, carry a strong recommendation against use.3
Several other options received limited, downgraded ratings ("may improve pain and function"): acupuncture, TENS units, FDA-approved laser therapy and extracorporeal shockwave therapy.3 The workgroup said the usefulness of dry needling was unclear and needed more evidence.3
What about arthroscopy?
Washing out or "cleaning up" an arthritic knee arthroscopically is not recommended when arthritis is the main diagnosis (moderate).3 Partial meniscectomy is a narrower case: the guideline says it can be used for meniscal tears in people with mild to moderate arthritis whose symptoms persist after physical therapy or other nonsurgical care.3
What these treatments cost if you pay cash
We did not find a neutral, recent source that publishes cash prices for these treatments across U.S. or Canadian markets, so we are not printing numbers. Prices vary by city, by whether a physician or a physical therapist delivers the care, and by whether imaging guidance is used for an injection or ablation.
- Ask for the all-in price: office visit, the procedure, imaging guidance and any follow-up visit.
- For PRP or gel injections, ask how many injections are in the course and whether the quote covers all of them.
- For ablation, ask whether the diagnostic block is billed separately.
- For physical therapy, ask the per-session cash rate and how many sessions the therapist expects.
- Get every quote in writing before you book.
Spending heavily on low-evidence injections can eat into money you might later want for a replacement. If you are in Canada and weighing a long public wait, our guide to Canadian wait-list options covers what people do while they wait.
Signs it may be time to consider replacement
There is no score that tells you when to switch from nonsurgical care to surgery. These patterns are reasons to have that conversation with an orthopedic surgeon:
- You have given exercise, weight management and medications a real trial, and pain still limits walking, stairs or sleep.
- Steroid injections help for less time than they used to, or not at all.
- Your X-rays show advanced arthritis and your symptoms match what the imaging shows.
- You are building your life around the knee: skipping trips, avoiding stairs, giving up work or caregiving.
- The knee is becoming visibly bowed or knock-kneed, or it locks or gives way.
Sudden severe swelling, redness and fever in a knee, especially one that has been injected, can mean infection and needs same-day medical care.
When you get to that point, our walkthrough on deciding whether it is time and our total versus partial knee questions are the natural next reads. If you want to compare what a replacement would cost abroad with what you are spending now, you can request cost ranges.