Information checked 25 October 2026. General information, not individual medical advice.
Can PRP help if my knee keeps giving way?
The cause needs assessing first. Giving way is not a diagnosis, and PRP should not be offered simply because a knee feels unreliable. Mayo Clinic advises contacting a doctor if your knee feels unstable or gives out, or you cannot bear weight. A procedure enquiry should not delay that assessment. Once the cause is clearer, a clinician can discuss whether PRP is relevant at all. [1]
Describe the event precisely
Explain whether the knee buckles during walking, feels weak on stairs, catches, or becomes stuck so you cannot move it normally. Say whether there was an injury, swelling or a sudden change. These details help the clinician choose the next step. Do not label the problem arthritis or a torn ligament solely from how it feels.
When to seek help rather than book a routine procedure
Seek prompt medical assessment if you cannot bear weight, the knee is markedly swollen, you cannot fully bend or straighten it, it has an obvious deformity, or there is severe pain after an injury. Fever together with redness, pain and swelling also needs medical assessment. Mayo Clinic lists these as reasons to contact a doctor. Use an urgent local medical service when symptoms are severe or sudden; do not wait for a routine injection appointment. [1]
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Why a PRP decision comes later
PRP is sometimes discussed for knee osteoarthritis, but that is a specific clinical indication rather than a treatment for every reason a knee buckles. NICE says evidence on efficacy for knee osteoarthritis is limited in quality and recommends special arrangements for clinical governance, consent and audit or research. It does not establish PRP as a treatment for undiagnosed instability. [2]
What the assessment should clarify
Ask what diagnosis best explains the symptoms, whether examination or imaging is needed and what activities are safe while you wait. If osteoarthritis is diagnosed, ask how rehabilitation and other options fit alongside any injection discussion. A good plan explains the problem being treated and what PRP would not be expected to change.
Make your goals practical
Describe the activity you want to regain: walking to work, descending stairs or returning to a particular exercise. Ask which outcome will be reviewed and when. Less pain and a mechanically stable knee are different goals. An injection should not be described as a guarantee that the knee will stop giving way.
Discuss joint treatment once the cause is clear
The London PRP Clinic by The Wellness can discuss a joint assessment and whether a PRP consultation is appropriate. Provide your diagnosis if known, previous reports and treatments, and the pattern of giving-way episodes. Confirm what the appointment includes, the proposed treatment and total fee before paying. If symptoms meet urgent advice criteria, use the urgent route first.
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What the examination is trying to distinguish
Mayo Clinic describes knee pain as potentially arising from injuries, mechanical problems, arthritis and other causes. During an assessment the clinician may check swelling, tenderness, warmth, movement and stability, and consider imaging according to the suspected problem. Giving way therefore starts a diagnostic discussion. It does not, by itself, identify a particular damaged structure or prove that an injection is the appropriate first step. [1,3]
Imaging should answer a clinical question
Mayo Clinic describes different roles for X-rays, ultrasound, CT and MRI in investigating knee problems. They are not interchangeable upgrades. Ask what the clinician suspects, what a scan would clarify and whether the result would change the plan. Bring existing reports rather than paying to repeat imaging without a reason. The right investigation depends on the history and examination, not the price of a procedure package. [3]
What a major PRP trial found
The RESTORE trial, published in JAMA in 2021, randomised 288 adults aged 50 or older with mild to moderate radiographic knee osteoarthritis to PRP or saline injections. At 12 months, neither the difference in knee pain nor the difference in medial tibial cartilage-volume change was statistically significant. This was an osteoarthritis trial, not a trial of every cause of giving way. It is important evidence against promising cartilage regrowth or a guaranteed benefit. [4]
Why an honest consultation still has value
PRP research and clinical recommendations should be discussed in relation to your diagnosis and goals. NICE requires special arrangements for consent and governance because efficacy evidence for knee osteoarthritis is limited in quality. A consultation should explain that uncertainty, other options and what would count as a useful response. Paying for a premium service should not mean being steered towards an injection regardless of whether it fits the problem. [2,4]
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Prepare before contacting the clinic
Write down when the knee gives way, any injury, swelling, inability to bear weight or restriction in movement, and the activities you want to return to. Bring previous reports and a list of treatments already tried. Ask The London PRP Clinic by The Wellness whether a joint assessment is the appropriate next step and what the total fee includes. If you have urgent symptoms, seek medical assessment first rather than waiting for a routine procedure enquiry.
Common questions
Does giving way always mean a ligament tear? No: a symptom alone cannot establish the cause. Does every knee need an MRI before PRP? The assessment determines whether imaging is useful. Is PRP proven to repair every unstable knee? No. Can I wait for an injection appointment if the knee is newly locked or cannot bear weight? Seek urgent advice instead. [1,2]
Sources
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