Back Pain Doctor
Knee Osteoarthritis
Osteoarthritis of the knee involves gradual changes to the cartilage and other structures within the joint. It is very common with age, and the degree of change seen on imaging does not always match how much pain a person has.
The cornerstone of management is keeping the muscles around the knee strong, maintaining activity and a healthy weight, and using simple pain measures as needed. These approaches have strong evidence and remain important regardless of any other treatment.
Where pain persists despite these measures, there are additional options to consider — including injection treatments such as PRP, which has been studied specifically for knee osteoarthritis. We will give you a clear, evidence-based view of what each option can realistically offer for your knee, and when an orthopaedic opinion is appropriate.
Common symptoms
- Knee pain that worsens with activity and eases with rest
- Stiffness, especially after sitting or first thing in the morning
- Swelling, grinding or a feeling of the knee "giving way"
- Reduced ability to walk, climb stairs or squat
Commonly seen in
Evidence for twelve treatment options in knee osteoarthritis
This is not a fixed ladder or a package of treatments. Every option is assessed independently against this diagnosis, including treatments with limited direct research that may still be reasonable for a clearly defined tissue target. The evidence level, likely benefit, risks, cost and alternatives are weighed at consultation.
Foundation — diagnosis, education and rehabilitation
The part of care with the broadest relevance. For many people it is enough on its own; other options are judged against it, not automatically added after it.
Diagnosis, education and progressive rehabilitation Working out what is driving the pain, explaining what your imaging does and does not mean, and building a graded loading plan you can actually follow. Core care
What it involves
Assessment to identify the likely pain source, an explanation of what the diagnosis means, adjustment of the loads that aggravate it, and a progressive strength and conditioning plan — with weight management where that is clinically relevant.
What the evidence shows
Exercise is the core treatment, and it performs as well as the tablets. A network meta-analysis of 152 randomised trials and 17,431 patients found exercise gave the same pain relief and functional improvement as oral anti-inflammatories and paracetamol, with a far better safety profile (Weng, Br J Sports Med 2023). EULAR (Moseng, Ann Rheum Dis 2024) and the American College of Rheumatology (Kolasinski, Arthritis Rheumatol 2020) both make exercise, education and weight management the core of non-pharmacological care. An individual-participant meta-analysis of 31 trials and 4,241 patients is honest about the size of it: the average effect is small and of questionable clinical importance, and those with more pain and worse function at the start benefit most (Holden, Lancet Rheumatol 2023).
Pairing reviewed 2026-09-02.
Where it fits for you
Worth being straight about: the average effect is modest, and it is larger for people who are struggling more to begin with. What it does have over the alternatives is that it is safe to keep doing, and it works on the things a joint injection cannot — strength, capacity and weight.
Muscle and symptom-modifying options
Useful only when the examination identifies the tissue they target or when short-term pain control creates a useful rehabilitation window.
Wet needling and trigger point injection (trigger point injection) A fine needle into a tender band of muscle, with a small volume of dilute glucose solution injected through it. Dry needling evidence
What it involves
The needle is placed into the tender muscle band and a small volume of 5% glucose with 0.02-0.08% lignocaine is injected. Often done in the same visit as your assessment, and usable where the tender area sits deeper. Dry needling — the same technique with nothing injected — is not offered here.
What the evidence shows
The needling evidence at this joint is substantial, but all of it is dry needling rather than the injected form this row describes. A meta-analysis of 20 randomised trials in 1,234 people with knee osteoarthritis or patellofemoral pain found that needling myofascial trigger points reduced pain (weighted mean difference -1.25, 95% CI -1.58 to -0.92) and improved the WOMAC function score (-6.59, -8.88 to -4.29) at moderate certainty, with the authors cautioning that blinding was poor and follow-up short (Hu, PLoS One 2026). Adding trigger point dry needling to a physiotherapy programme in 40 people improved pain by a further 1.96 points and the WOMAC score by 11.86 at four weeks and three months (Morshedlou, Physiother Theory Pract 2025), and needling of the popliteus alongside exercise in 38 people held an advantage in pain and function at six months over sham needling with the same exercise (Agost-González, Sci Rep 2025). For the injected form the base is empty: a search of trigger point injection trials at the knee, quadriceps and calf returned one record, and it tested a vibrating device for making the injection more comfortable rather than whether the injection helps knee osteoarthritis (Moon, Arch Phys Med Rehabil 2019).
Pairing reviewed 2026-09-19.
Where it fits for you
Directed at a tender band in the quadriceps, calf or popliteus that reproduces part of your knee pain, alongside the loading programme. It does not treat the joint surface, and the trials behind it used a needle without an injectate.
Ultrasound-guided injections Guidance means we can see the needle reach the target. What goes into the needle depends on the diagnosis. Good support
What it involves
The injection is performed under ultrasound so the needle can be watched into the target structure. What is injected is decided by the diagnosis — and corticosteroid is used sparingly, for the reasons set out below.
What the evidence shows
Ultrasound improves needle-placement accuracy, but guidance is not a treatment in itself: benefit depends on a valid injectable target and what is injected. Condition reviewed: knee osteoarthritis.
Evidence source: Oo et al., ultrasound-guided injection systematic review (2024)
Pairing reviewed 2026-08-30.
Where it fits for you
For knee osteoarthritis, an ultrasound-guided injection is considered only when there is a specific diagnostic question or a separate joint, bursa, sheath or nerve target. The injectate and purpose are stated before treatment.
V-ACTOR vibration therapy (vibration therapy) Low-frequency vibration applied over tender muscle. Not a shockwave, despite sharing the machine. Plausible — no studies
What it involves
A vibration handpiece is moved over the tender muscle and fascia for a few minutes. It runs from the same STORZ MASTERPULS icon console as radial shockwave but is a separate handpiece delivering a different, gentler form of energy. No needles, no anaesthetic, no downtime.
What the evidence shows
No published clinical trial of this device in this condition. It is a vibration handpiece delivered from the same console as radial shockwave, and the rationale is myofascial rather than tendon- or bone-directed.
Pairing reviewed 2026-08-30.
Where it fits for you
A comfort measure used within a session where muscular tightness is limiting movement. Never the reason for the appointment, and not a substitute for the treatments that do have evidence.
Energy-based treatment options
Radial pressure wave, focused shockwave and EMTT have different targets and different evidence. They are assessed separately rather than treated as one category.
Radial or focused shockwave? Read the overviewRadial shockwave (radial pressure wave) Broad treatment across tender muscle and fascia, close to the surface. Only if relevant
What it involves
A handpiece is moved over the tender tissue while ballistic pressure pulses are delivered, using a transmitter head chosen for the tissue — including heads shaped for fascia and for the muscle either side of the spine. The pulse is strongest at the skin and weakens with depth, so this is mainly a myofascial treatment, though it can reach deeper in some areas. No anaesthetic, no downtime, usually a course of sessions about a week apart.
What the evidence shows
Shockwave reviews in myofascial pain report a possible benefit but mix protocols and often mix radial pressure wave with focused shockwave; that evidence cannot be transferred to the underlying diagnosis. Condition reviewed: knee osteoarthritis.
Evidence source: Wu et al., shockwave for myofascial pain review (2022)
Pairing reviewed 2026-08-30.
Where it fits for you
For knee osteoarthritis, radial pressure wave may be considered for a distinct superficial muscle or fascial component. It is not used as evidence of benefit for the primary diagnosis.
Focused shockwave (ESWT) A true shock wave converging at depth — for tendon, joint, ligament and bone. Good support
What it involves
A focused system generates an acoustic shock wave that converges at a focal point set at a defined depth, concentrating the energy where the target is. This is the form we use for tendon, joint, ligament and bone. Typically four to six sessions about a week apart, no anaesthetic and no formal downtime.
What the evidence shows
A 12-trial meta-analysis favoured shockwave over sham for pain at short, medium and long term and for function at short term (Silva, Clin Rehabil 2022). A meta-regression of 50 trials and 4,844 patients found significant effects on treatment success, pain and function, with energy level and treatment duration predicting response (Liao, Clin Rehabil 2019).
Pairing reviewed 2026-08-30.
Where it fits for you
Reasonable to discuss where knee arthritis pain is limiting the strength and conditioning work. It treats pain, not the joint surface, and does not change the natural history.
EMTT (magnetotransduction therapy) High-energy magnetic pulses applied over the area. Painless, no contact. Plausible — no studies
What it involves
You sit with the applicator positioned over the area for a short session. Painless, no gel or contact required, and usually delivered as a course — commonly alongside shockwave.
What the evidence shows
There are no published randomised trials of EMTT in this condition, or in any musculoskeletal condition, that we can point to. The supporting work is laboratory work: EMTT increased tenocyte proliferation, migration and collagen expression in cultured human tendon cells (Mancini, Int J Mol Sci 2025). The nearest human evidence for a related electromagnetic therapy is negative — a randomised trial of pulsed electromagnetic field therapy added to eccentric exercise for Achilles tendinopathy found no improvement in outcome scores or tendon neovascularity over eccentric exercise alone (Ko, Orthop J Sports Med 2024).
Pairing reviewed 2026-08-30.
Where it fits for you
Offered only as an adjunct alongside treatment that does have evidence, never as the plan itself, and only after that gap is explained. Much of the EMTT literature is manufacturer-affiliated, which is part of why we describe it this way.
Biologic and joint injection options
Each injection is assessed independently for the named diagnosis. Cost, uncertainty, likely benefit, risks and alternatives are part of the decision.
Platelet-rich plasma (PRP) Your own blood, concentrated and injected under ultrasound guidance. Worth discussing
What it involves
Blood is taken from your arm, spun to concentrate the platelets, and injected into the target under ultrasound guidance in the same appointment.
What the evidence shows
PRP is one of ten injection therapies compared in a network meta-analysis of 80 trials and 6,934 patients in knee osteoarthritis; it performed well, though dextrose prolotherapy plus physical therapy ranked highest for pain and function (Liao, Int J Mol Sci 2023).
Pairing reviewed 2026-08-30.
Where it fits for you
A reasonable option to discuss, with the honest point that the comparative data does not put it ahead of the alternatives here.
Prolotherapy (dextrose) A course of dextrose injections into and around the structure and its attachments. Good support
What it involves
Hypertonic dextrose is injected at the tender ligament and tendon attachments, and into the joint where relevant, usually as a series of treatments a few weeks apart.
What the evidence shows
A meta-analysis of 14 trials and 978 patients found dextrose prolotherapy favourable against both placebo injection and non-invasive control for pain, global function and quality of life, with dose- and time-dependent effects (Chen, Clin Rehabil 2022). A network meta-analysis of 80 trials and 6,934 patients found dextrose prolotherapy combined with physical therapy the MOST effective of ten injection-plus-therapy regimens for both pain (SMD -2.54) and global function (SMD 2.28) (Liao, Int J Mol Sci 2023). An open-label follow-up reported progressive improvement sustained to 2.5 years (Rabago, Complement Ther Med 2015).
Pairing reviewed 2026-08-30.
Where it fits for you
One of the better-supported uses of prolotherapy anywhere, and the evidence is strongest when it is combined with a loading programme rather than given alone.
Viscosupplementation (hyaluronic acid) A gel-like injection into an arthritic joint. Widely used, and genuinely contested. Evidence mixed
What it involves
One or a short series of hyaluronic acid injections into the joint under ultrasound guidance.
What the evidence shows
Guideline bodies genuinely disagree. Some conclude the average benefit over a placebo injection is small and advise against routine use; others allow it in selected patients. Part of the difficulty is that injection itself often helps in trials, which makes the specific effect of the hyaluronic acid hard to isolate. A randomised trial found hyaluronic acid combined with hypertonic dextrose outperformed hyaluronic acid with saline on function at 6 months (Hsieh, Arch Phys Med Rehabil 2022).
Pairing reviewed 2026-08-30.
Where it fits for you
Discussed where corticosteroid is unsuitable or has already been used repeatedly, and where you would like a non-steroid option before a surgical opinion. The disagreement is stated rather than glossed over.
Nerve-targeted options
Relevant when examination identifies a superficial neuropathic pattern or a compressed peripheral nerve—not simply because pain is present.
Lyftogt perineural therapy (perineural injection therapy) A series of small dilute dextrose injections just under the skin, over tender superficial nerves. Plausible — no studies
What it involves
Small injections of low-concentration dextrose, usually 5%, placed just beneath the skin along tender superficial nerves. Given as a series of short sessions.
What the evidence shows
No controlled trial has tested perineural dextrose injection in knee osteoarthritis. The only published series is a retrospective review of 10 patients given three monthly ultrasound-guided injections of 5% dextrose around the back of the knee, reporting a 52% fall in WOMAC score held at twelve months — and its authors state that placebo, regression to the mean and natural fluctuation cannot be excluded at that sample size (Lam, Diagnostics 2026).
Pairing reviewed 2026-09-05.
Where it fits for you
Not one of the established options for knee osteoarthritis, and it should not be confused with the injections given into the joint itself, which have their own separate evidence. Discussed only as unproven.
Ultrasound-guided nerve hydrodissection Fluid placed around a nerve to free it from the surrounding tissue. Only if relevant
What it involves
Under ultrasound, fluid is placed in the plane around the nerve to separate it from the tissue that is tethering or compressing it.
What the evidence shows
Knee osteoarthritis appears in the hydrodissection literature, but as joint distension rather than nerve treatment. A scoping review of 21 included studies lists it among the conditions where ultrasound-guided hydrodissection and hydrodilatation may improve pain and function, while pooling the two techniques and noting the evidence is early and heterogeneous (Leahy, Front Pain Res 2026). The row here is hydrodissection of a nerve, a different procedure with a different target, and no trial has tested that for knee osteoarthritis.
Pairing reviewed 2026-09-08.
Where it fits for you
Only where a nerve is contributing separately to the knee pain. The arthritis itself is treated by the options higher up this page.
This is general information only and suitability is assessed individually. Treatments with limited or condition-dependent evidence may still be discussed, but only with clear explanation of the uncertainty, the expected benefit, risks, cost and alternatives. Red flags, progressive neurological symptoms or suspected serious pathology require a different pathway.
Every treatment above is described in full on the non-surgical treatments page, including what each one is used for and what the evidence supports. Ratings apply to the named diagnosis; an adjacent muscle, tendon, joint or nerve problem is assessed as a separate target.
Corticosteroid injection is reviewed separately for each diagnosis.
Cortisone reliably reduces pain in the short term, and that can be genuinely useful when pain is stopping you sleeping or moving enough to rehabilitate. Beyond that window the picture changes. A systematic review of 41 randomised trials and 2,672 participants found that corticosteroid injection reduced pain in the short term but that the effect reversed at intermediate and long term; in pooled analysis for lateral epicondylalgia the short-term effect was large (SMD 1.44, 95% CI 1.17 to 1.71) while no intervention was favoured at 26 weeks (-0.40, -0.67 to -0.14) and at 52 weeks (-0.31, -0.61 to -0.01) (Coombes, Lancet 2010). In a randomised trial in lateral epicondylalgia, 83 per cent of the corticosteroid group had completely recovered or much improved at one year against 96 per cent given a placebo injection, and recurrence ran at 54 per cent against 12 per cent; adding physiotherapy made no significant difference at one year (Coombes, JAMA 2013). In joints, repeated corticosteroid injections have been associated with cartilage loss. It does not repair anything.
So we do not build treatment plans around it. Where an injection is the right call, we review the specific diagnosis and target, discuss what is being injected and why, keep the number low, and pair it with the loading work that changes the longer-term course.
When we would still consider it
- Pain severe enough to block rehabilitation
- A clear inflammatory or bursal target on imaging
- A specific short-term goal — a trip, a procedure, a return to work
- Diagnostic use, where the response tells us where the pain is coming from
When a cortisone injection is worth doing, and when it is not
Other knee conditions
Pain in the same area can come from more than one source, and the label matters less than what the examination and history point to. These are the other guides for this region.
Frequently asked questions
Is exercise safe if I have knee osteoarthritis?
What about PRP for my knee?
Will I need a knee replacement?
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