PRP cannot straighten a bow-legged knee. For some people with knee osteoarthritis, platelet-rich plasma injections may help symptoms, but joint alignment affects how load passes through the knee and may influence the response. Before paying for a course, ask whether your diagnosis, alignment, arthritis severity and rehabilitation plan make PRP a sensible option.
For an active professional, the real goal is usually easier walking, stairs or exercise, rather than an impressive scan or an injection timetable. This guide explains what a recent alignment study can tell you, and what it cannot.
Does being bow-legged change the likely benefit of knee PRP?
It may. A study published online in March 2026 followed 210 people with knee osteoarthritis who received PRP. Participants were grouped by their baseline varus angle: 0 to 5 degrees, 6 to 10 degrees, and 11 to 15 degrees, with 70 people in each group. Greater varus alignment was associated with less improvement in pain and function at several follow-up points. [1]
This is useful evidence for assessment, not a rule that one angle guarantees success or failure. The groups were not randomly assigned to different alignments, and the study did not compare PRP with a placebo-injection group. Improvements after treatment therefore cannot all be attributed to PRP. Other differences between patients may have affected the results.
Considering PRP for knee pain? Ask The London PRP Clinic about an assessment. Mention a bow-legged appearance, any existing X-rays and what you want to get back to doing. Suitability should come before a package decision.
What are varus and valgus alignment?
Varus is commonly described as bow-legged alignment, while valgus is often described as knock-kneed alignment. These terms describe how the leg is aligned, not the whole diagnosis. The distribution of load across the knee can matter in osteoarthritis, alongside muscle strength, body weight, injury history and the pattern of joint damage.
A photograph or the position of your feet in a mirror cannot provide a reliable mechanical-axis measurement. A clinician may use an examination and appropriate weight-bearing imaging when it will change the treatment plan. Not everybody with knee pain needs a new scan.
The 2026 study assessed varus groups. It should not be presented as proof of an identical effect in every form of valgus alignment or every other knee condition. [1]
Can PRP correct alignment or rebuild the knee?
No. PRP is not an alignment-correction procedure, and the study does not establish that it reverses joint wear or regrows a normal knee. A symptomatic improvement and a structural correction are different outcomes.
PRP preparations and injection protocols vary. Evidence from one product or protocol cannot automatically be applied to another clinic's treatment. Ask the clinician how the evidence relates to the proposed preparation, how many injections are suggested and why, and how your own response will be measured.
Be cautious of a promise that the injection will remove the need for all future treatment. The meaningful question is whether a possible improvement in pain or function is worth the cost and uncertainty for you.
What should be assessed before an injection?
A useful consultation should establish the cause of the pain rather than assuming that all knee symptoms come from osteoarthritis. The discussion may include:
- Where the pain occurs, when it began and what makes it worse.
- Swelling, locking, giving way, injury or previous surgery.
- Examination findings, arthritis severity and any alignment concern.
- Existing imaging and whether more imaging would change care.
- Medicines, bleeding risk, previous injections and relevant health conditions.
- The rehabilitation or load-management plan alongside any procedure.
A sudden hot, swollen knee, fever, major injury or inability to bear weight needs prompt medical assessment. It should not be routed straight into an elective PRP package.
What can the 2026 study tell me about the result?
In the study, all three groups reported improvements from baseline, with the most notable gains at three and six months. People with less varus alignment generally had better pain and function results than those with the greatest varus alignment at several time points. [1]
The study supports discussing alignment as one factor in counselling. It does not supply a personalised percentage chance of success, prove that a particular degree is a treatment cut-off or establish that an injection is preferable to every alternative.
Ask for an explanation in terms of your own goals. For example: "If my pain improves but I still cannot walk the distance I need, what would we do next?" A good answer includes a reassessment point, rather than an automatic additional course.
How do rehabilitation and other options fit in?
An injection does not replace strength, movement and load-management work tailored to you. Depending on the assessment, a clinician may discuss physiotherapy, weight management where relevant, medicines, a brace or an orthopaedic opinion. The right combination depends on the individual problem.
If substantial deformity, advanced disease or major functional limitation is present, ask whether a specialist surgical opinion is more useful than repeated injections. Discussing another route is not a failure of care. It prevents a convenient procedure becoming an expensive delay.
How should I compare the cost of knee PRP in London?
Compare complete written plans rather than headline injection prices. Ask whether the quote includes the assessment, imaging guidance if indicated, the proposed number of injections, review appointments and management of a poor response.
The clinic's services page describes its PRP options, but the appropriate knee plan and total should be confirmed after assessment. A hair PRP price is not a knee-treatment quote. Nor should a premium London price be treated as proof of better clinical results.
The value of an assessment is knowing why the proposed treatment fits your diagnosis, what the uncertainty is and what happens next. Do not pay for a larger course simply to make the advertised per-session price lower.
Questions worth bringing to your appointment
Can I have PRP if I am bow-legged? Possibly, but an examination and an honest discussion of likely benefit are needed. The appearance alone does not answer the question.
Should I order a standing leg X-ray myself? Ask first. Imaging should answer a question that changes management.
Will PRP delay knee replacement? This study does not prove that it does. Avoid a fixed promise about avoiding surgery.
What should count as success? Agree a functional goal and a review point, such as walking distance, stairs or an appropriate pain and function score. Record your baseline before treatment.
Contact The London PRP Clinic to discuss suitability, or email team@thewellnesslondon.com. Tell the team what prior imaging and treatment you have already had.
Ask the team on WhatsApp, or call +44 20 3951 3429 to discuss the appropriate next step.
Evidence and further reading
- The Impact of Lower Extremity Mechanical Axis Alignment on the Success of Platelet-Rich Plasma Injections in Knee Osteoarthritis Patients. Orthopaedic Surgery, published online 13 March 2026. Observational comparison of 210 treated patients; association does not establish causation.
General information, not individual medical advice. Evidence checked 31 October 2026. PRP is not suitable for everyone and results are not guaranteed.