Medically reviewed by: Dr. Vijay Kumar Sohanlal, MBBS, MS (Orthopaedics), Orthopaedic and Joint Replacement Surgeon, Founder and Owner, MAHI Multispecialty Hospital, Kilpauk, Chennai
Last medically reviewed: September 2026
Knee arthritis rarely starts as a diagnosis. It starts as a bit of stiffness after sitting too long, a dull ache on the stairs, movements that used to be automatic now needing a moment’s thought. Most people manage this quietly for years before they ever consult a doctor about it.
By the time patients come in asking about PRP treatment for knee arthritis, they have usually already tried painkillers, maybe a physiotherapy course, and are looking for something that does more than mask the pain for a few hours. This page explains what PRP actually is, who it genuinely helps, what it costs, and where it fits alongside other treatment options.
What is PRP Therapy for Knee Arthritis?
Platelet Rich Plasma, or PRP, is prepared from a small sample of the patient’s own blood. The blood is spun in a centrifuge to concentrate the platelets, which contain growth factors involved in the body’s natural healing response. That concentrated plasma is then injected into the knee joint, usually under ultrasound guidance for accurate placement.
Because the plasma comes from the patient’s own body, the risk of allergic reaction is very low. PRP does not regenerate cartilage that has already been lost. What it aims to do is calm the chronic low grade inflammation inside an arthritic knee and support a healthier joint environment, which for the right patient can mean less pain and better movement.
What is Actually Happening Inside an Arthritic Knee
Knee arthritis is often described as simple wear and tear, but it involves several structures at once, which is worth understanding before deciding whether PRP is the right treatment.
Cartilage thinning. The smooth cartilage that lets the joint surfaces glide against each other gradually thins and roughens, which is why ordinary movements start to feel gritty or uncomfortable rather than smooth.
Ongoing low grade inflammation. The synovial lining inside the joint stays mildly inflamed for months or years at a time, not the short, sharp inflammation of an injury. This slow inflammation is a real driver of both pain and further cartilage breakdown, and it is the main target of PRP therapy.
Poorer joint lubrication. The synovial fluid that normally keeps the joint moving smoothly becomes less effective, which is part of why mornings tend to feel stiffer than the rest of the day.
Increased load on bone. As cartilage thins, the underlying bone starts absorbing forces it was not built to take directly, which over time contributes to bone spurs and reduced flexibility in the joint.
Understanding these four things matters because it explains why PRP works best earlier in the disease rather than once the joint is already bone on bone.
How PRP Actually Helps
PRP does not work like a painkiller or a steroid injection. It works gradually, by influencing the biology inside the joint rather than suppressing symptoms directly.
- It helps regulate inflammation rather than switching it off entirely, which supports a healthier joint environment over weeks rather than hours.
- Growth factors released by the platelets signal nearby tissue to begin repair processes in cartilage and the surrounding joint lining.
- Pain relief builds gradually, typically becoming noticeable over three to six weeks as inflammation settles.
- Joint lubrication often improves modestly, which can reduce the grinding or catching sensation some patients describe.
- In early to moderate arthritis, it may slow further deterioration, though it cannot reverse damage that has already occurred.
PRP Compared to Other Knee Arthritis Treatments
| Treatment | How it works | How fast it helps | How long it lasts | Best suited for |
| Pain medication | Reduces pain signals | Fast | Temporary | Short term flare control |
| Steroid injection | Suppresses inflammation | Fast | Weeks to a few months | Acute flare ups |
| Hyaluronic acid injection | Improves lubrication | Gradual | Temporary | Mild to moderate symptoms |
| Physiotherapy | Strengthens supporting muscles | Gradual | Lasting, with consistency | Foundation of every arthritis plan |
| PRP therapy | Supports biological healing and reduces chronic inflammation | Gradual, over weeks | Often 6 to 12 months or longer | Early to moderate arthritis, joint preservation |
| Knee replacement surgery | Replaces the damaged joint surfaces | After a recovery period | Long term | Advanced, bone on bone arthritis |
These are not competing options so much as different tools for different stages of the same condition. Physiotherapy belongs in almost every treatment plan regardless of what else is used, and PRP is often considered as a step between conservative treatment and surgery rather than a replacement for either.
Who Actually Benefits From PRP
PRP works by prompting the joint’s own healing response, so it depends on the joint still having some healthy tissue left to respond with. Patients who tend to see the most benefit include those with:
- Early to moderate knee arthritis, where cartilage loss is partial rather than complete
- Persistent symptoms despite physiotherapy, medication, and weight management
- A genuine interest in delaying knee replacement surgery while staying active
- Good general health, without conditions that would interfere with normal healing
Who Should Not Choose PRP
A proper evaluation matters, because PRP is not the right choice for every knee. It is generally not recommended for patients with:
- Advanced bone on bone arthritis, where very little cartilage remains to respond to treatment
- An active infection in or around the knee
- Certain bleeding or platelet disorders
- Uncontrolled underlying medical conditions that should be stabilised first
What Happens During the Procedure
A small blood sample is drawn, similar to a routine blood test. This is spun in a centrifuge to separate and concentrate the platelet rich plasma, which is then injected into the knee joint, typically under ultrasound guidance for precise placement. The full visit usually takes about 45 minutes to an hour, including preparation and a brief period of observation afterward.
Most patients notice mild soreness or slight swelling for a day or two, which usually settles on its own. Rest is generally advised for the first 24 to 48 hours, with a gradual return to normal activity after that.
Cost of PRP Treatment for Knee Arthritis
Cost is one of the first questions most patients ask, and it deserves a straight answer rather than being left out of the conversation. Across Chennai, PRP treatment for a single knee typically ranges from around eight thousand to twenty thousand rupees per session, depending on the clinic, the equipment used, and the specific case. Most patients are advised two to three sessions for meaningful results, though some see benefit from a single injection depending on severity.
Your exact cost will depend on your individual evaluation, so ask for a clear breakdown during your consultation rather than relying only on a general online range.
What Recovery Looks Like
| Timeframe | What to expect |
| First 24 to 48 hours | Rest the knee, avoid strenuous activity, mild soreness is normal |
| Two to four weeks | Gradual return to daily activity, physiotherapy often begins here |
| Four to twelve weeks | Progressive improvement in pain, stiffness, and overall function |
Results build slowly rather than appearing overnight. Patients expecting immediate relief the way a steroid injection provides it are often disappointed, while those who understand PRP as a gradual biological process tend to have realistic expectations that match what actually happens.
Getting the Most Out of PRP Afterward
PRP starts a healing process, but what you do afterward has a real effect on the outcome. Low impact movement such as walking on flat ground, swimming, or stationary cycling keeps the joint mobile without overloading it. Strengthening the muscles around the knee, particularly the quadriceps and hamstrings, through a structured physiotherapy plan gives the joint better support day to day. Maintaining a healthy weight reduces the load the knee carries with every step, and even modest weight loss can noticeably ease symptoms. None of this replaces the treatment itself, but skipping it tends to blunt the results.
What the Evidence Actually Shows
Clinical research on PRP for knee osteoarthritis has grown substantially over the past decade. The honest summary is that PRP shows meaningful benefit for pain and function in appropriately selected patients with early to moderate arthritis, particularly when combined with rehabilitation, but it is not a cure and outcomes vary from person to person depending on the stage of arthritis and how the PRP itself is prepared and delivered. Patients considering PRP should treat it as one part of a broader joint preservation plan rather than a standalone fix.
About Dr. Vijay Kumar Sohanlal
Dr. Vijay Kumar Sohanlal is an orthopaedic and joint replacement surgeon with over 18+ years of experience, trained internationally in Germany and Australia. He founded and leads MAHI Multispecialty Hospital in Kilpauk, Chennai, where regenerative treatments including PRP are offered as part of a broader joint preservation approach for patients with early to moderate knee arthritis. His approach favors exploring appropriate non surgical options first, and being honest with patients about when PRP is genuinely likely to help and when it is not the right fit.
Conclusion
PRP treatment for knee arthritis is not a cure, and it will not rebuild cartilage that is already gone. What it offers, for the right patient at the right stage, is a way to reduce pain, support the joint’s own healing response, and potentially delay surgery while staying active. The best results come from realistic expectations, a properly selected patient, and a treatment plan that includes physiotherapy and lifestyle changes alongside the injection itself.
If you are dealing with persistent knee pain and want an honest opinion on whether PRP is right for your knee specifically, book a consultation with Dr. Vijay Kumar Sohanlal at MAHI Multispecialty Hospital, Kilpauk, Chennai.
