PRP knee injection recovery usually begins with a few days of soreness, stiffness or swelling, followed by a gradual return to normal activity. Most people can walk after a PRP knee injection, but running, heavy exercise and strenuous lower-body training normally need to wait.
Improvement is not usually immediate. Some patients begin noticing a difference after several weeks, while the full response may take a few months. Recovery varies according to the condition being treated, the severity of the knee problem and the rehabilitation plan you have been given.
Who Is This Guide For?
This guide is for anyone considering or recovering from a PRP injection for knee osteoarthritis, persistent knee pain or a selected tendon or ligament problem. It explains what may happen after treatment, how activity is usually increased and when improvement may become noticeable.
What is a PRP injection for the knee, and what does it treat?
Platelet-rich plasma, usually shortened to PRP, is prepared from a sample of your own blood. The blood is processed in a centrifuge to separate and concentrate the platelets before the PRP is injected into the area being treated.
Platelets contain proteins and signalling substances involved in healing. PRP is intended to support the body’s natural repair response rather than simply numb pain. It should not, however, be presented as a guaranteed way to regrow cartilage or cure osteoarthritis.
At RAD Clinics, a clinical assessment is carried out before a PRP knee injection is recommended. This helps us consider whether your pain is more likely to come from the joint, cartilage, tendons, ligaments or another structure, and whether PRP is a reasonable option for your symptoms.
Which knee conditions may be treated with PRP?
| Condition | Why PRP may be considered | Possible goal |
|---|---|---|
| Mild-to-moderate knee osteoarthritis | A common indication for knee PRP | Reduce pain and improve function |
| Patellar tendinopathy | Persistent tendon symptoms | Support tendon rehabilitation |
| Quadriceps tendinopathy | Chronic tendon pain | Support the healing response |
| Early cartilage-related symptoms | Selected non-surgical cases | Improve symptoms and function |
| Selected ligament injuries | When clinically appropriate | Support recovery alongside rehabilitation |
How does PRP for knee osteoarthritis work?
PRP is thought to influence inflammation and repair processes within the knee. Research suggests that it may reduce pain and improve function for some people with mild-to-moderate knee osteoarthritis, although results vary and not everyone benefits.
When PRP is discussed at RAD Clinics, we explain the expected gradual response, the limits of the evidence and the other treatments that may be suitable. The aim is to help you make an informed decision rather than promise a particular result.
What happens immediately after a PRP knee injection?
It is understandable to feel concerned if your knee becomes more uncomfortable after treatment. Mild-to-moderate soreness, stiffness, bruising or swelling can occur during the first few days and does not necessarily mean that something has gone wrong.
You may feel pressure or brief discomfort during the injection itself. Pain levels differ between patients and depend partly on the sensitivity of the knee and the area being treated.
At RAD Clinics, PRP knee injections are performed with ultrasound guidance. The ultrasound scan allows the clinician to view the target area and guide the needle in real time, helping the treatment reach the intended location as accurately as possible.
What should I do during the first few days?
Your RAD Clinics clinician may advise relative rest for the first 48–72 hours. This usually means gentle daily movement rather than complete bed rest, while avoiding long walks, heavy lifting or demanding exercise.
- Keep walking to short, comfortable distances.
- Avoid running, jumping and heavy lower-body training.
- Use only the pain relief recommended for you.
- Use ice only if this forms part of your personalised aftercare advice.
- Avoid anti-inflammatory medicines such as ibuprofen or naproxen for the period advised by your clinician.
Do not stop prescribed aspirin, anticoagulants or other regular medicines without speaking to the healthcare professional responsible for them. Medication advice varies according to the procedure and your medical history.
Why might my knee feel worse after PRP?
A temporary increase in soreness may be part of the early response to treatment. It does not automatically mean that the PRP injection has failed. However, pain should gradually become more manageable rather than continue worsening.
RAD Clinics provides aftercare guidance following the injection so that you know what is expected and when to contact us or seek further medical advice.
How long does recovery take after a PRP injection in the knee?
There is no exact PRP knee injection recovery schedule that applies to everyone. A practical guide is shown below, but your own progress may be faster or slower.
| Recovery stage | Approximate period | What you may notice |
|---|---|---|
| Initial response | Days 1–3 | Soreness, stiffness or mild swelling |
| Early recovery | Week 1–2 | Post-injection discomfort begins to settle |
| Rehabilitation stage | Weeks 2–6 | Gradual increase in movement and strengthening |
| Possible treatment response | Weeks 6–12 | Some patients notice improving pain and function |
| Later response | Months 3–6 | Further improvement may develop in responsive patients |
This timeline is only a guide. Recovery may take longer if you have advanced osteoarthritis, a longstanding tendon problem or another condition affecting your mobility. At RAD Clinics we tailor aftercare advice for your specific diagnosis, the treatment area and your normal activity level.
When will my knee begin to feel better?
PRP is not intended to provide the rapid numbing effect associated with a local anaesthetic. Improvement, when it occurs, is usually gradual and may become more noticeable after six to eight weeks. Some people improve earlier, while others need longer.
Benefits may continue for several months, but the duration is unpredictable. Arthritis severity, activity levels, body weight, general health and engagement with rehabilitation can all influence the outcome.
Will I need more than one PRP injection?
Some people have one PRP knee injection, while others may be offered a planned course. At RAD Clinics, the recommendation is based on your diagnosis, symptom severity, response to previous treatment and progress after the first injection. A repeat treatment is not automatically required for everyone.
Can I walk and drive after a PRP knee injection?
Most patients can walk carefully after the procedure, although the knee may feel sore. The RAD Clinics team normally advises keeping distances short and comfortable during the early recovery period rather than testing the knee with a long walk straight away.
Driving depends on which knee was treated, whether you drive a manual or automatic vehicle and whether you can safely perform an emergency stop. Do not drive if pain, stiffness or medication affects your concentration or control of the pedals.
It may be sensible to arrange transport home after a RAD Clinics PRP injection, particularly when the right knee has been treated. Your motor insurer may also have requirements that you should check.
When can I return to exercise or sport?
A gradual return to movement is usually more helpful than either pushing too quickly or avoiding activity for too long. The following times are broad examples rather than fixed deadlines.
| Activity | Possible return time |
|---|---|
| Gentle walking | Same day, if comfortable |
| Routine daily activities | Within 1–3 days |
| Low-impact exercise | Around 1–2 weeks |
| Progressive gym strengthening | Around 2–4 weeks |
| Running or high-impact sport | Often 4–8 weeks or later |
At RAD Clinics, physiotherapy may form part of recovery after a PRP knee injection. Our physiotherapists can guide gradual strengthening, mobility, movement control and a safe return to exercise based on your symptoms and treatment goals. Where appropriate, physiotherapy can be coordinated with ultrasound findings and the injection aftercare plan.
What activities should I avoid?
- Running and jumping during the initial recovery period.
- Heavy squats, lunges or leg presses before you are ready.
- High-impact or competitive sport too soon after treatment.
- Long periods of stair climbing if this increases symptoms.
- Anti-inflammatory medicines unless your clinician has advised otherwise.
The restrictions recommended by RAD Clinics may differ depending on whether the PRP injection was placed in the joint or around a tendon or ligament. Follow your individual aftercare instructions.
How does PRP compare with other knee injection treatments?
Several injection treatments may be considered for knee osteoarthritis or persistent knee pain. They work in different ways and are not interchangeable.
| Treatment | Typical onset | Possible duration | Main purpose |
|---|---|---|---|
| Corticosteroid | Often within days | Weeks to months | Reduce inflammation and pain |
| Hyaluronic acid | Usually gradual | Several months in some patients | Improve lubrication and symptoms |
| PRP | Usually several weeks | May last 6–12 months or longer | Support biological repair and symptom improvement |
| Arthrosamid hydrogel | Usually gradual | Potentially longer term | Cushioning and symptom control |
At RAD Clinics, the choice between PRP, corticosteroid, hyaluronic acid, Arthrosamid or another approach begins with a clinical assessment. Ultrasound scanning may be used to assess relevant soft tissues and to guide an injection accurately when treatment is appropriate.
Is PRP better than a cortisone injection?
Corticosteroid injections may provide quicker relief when inflammation is a major feature, while PRP generally has a slower onset. Some studies suggest that PRP may provide longer-lasting improvement for selected people with mild-to-moderate knee osteoarthritis, but this does not make it the best choice for every patient.
RAD Clinics discusses the likely advantages and limitations of each injection option so that treatment reflects your diagnosis, medical history and goals.
Is PRP or hyaluronic acid better?
Both treatments may help selected patients. PRP aims to influence biological healing and inflammatory processes, whereas hyaluronic acid mainly aims to improve joint lubrication and symptoms. At RAD Clinics, suitability is considered individually rather than choosing one treatment solely because it is newer or more widely advertised.
Who may not be suitable for a PRP knee injection?
PRP may be unsuitable or require additional medical review if you have:
- An active infection.
- A significant blood or platelet disorder.
- Concerns relating to anticoagulant medication.
- Certain serious or unstable medical conditions.
- Very advanced knee osteoarthritis.
- A cause of pain for which another treatment is more appropriate.
A specialist assessment at RAD Clinics is therefore required before an ultrasound-guided PRP injection is arranged. We may recommend a different injection, physiotherapy, further imaging or review by your GP or consultant when PRP is unlikely to be the most appropriate next step.
When should I seek medical advice after PRP?
Contact RAD Clinics if pain or swelling is not settling as expected, your aftercare instructions are unclear, or you are worried about your recovery.
Seek prompt medical advice if you develop rapidly worsening pain, spreading redness, marked warmth, fever, discharge from the injection site or increasing difficulty bearing weight. These symptoms could be from an infection at the injection site and are uncommon, but they should be assessed promptly.
How can I access a private PRP knee injection at RAD Clinics?
RAD Clinics provides private ultrasound-guided PRP treatment for suitable knee, joint and tendon conditions. You can self-refer directly, although a clinical assessment and, where appropriate, an ultrasound scan are required to confirm whether the injection is suitable.
A RAD Clinics appointment may include:
- Review of your symptoms, medical history and previous treatment.
- Clinical examination of the knee.
- Ultrasound scanning where this may add useful information.
- Collection and preparation of your blood sample.
- Ultrasound-guided PRP injection.
- Personalised aftercare, physiotherapy advice and follow-up planning.
Our team can confirm current clinic availability and appointment options. Please note that our fees may change over time, so we always recommend checking the latest price with our team before booking.
Key Takeaways
- Mild soreness, stiffness and swelling can occur during early PRP knee injection recovery.
- Most patients can walk carefully after treatment, but strenuous activity is usually reduced for several days.
- Improvement is gradual and may take six to twelve weeks or longer.
- RAD Clinics uses ultrasound guidance for PRP knee injections to help place treatment accurately.
- Physiotherapy at RAD Clinics may support strength, mobility and a safe return to activity.
- PRP can help selected patients, but results are not guaranteed, and treatment is not suitable for everyone.
Common Questions About PRP knee injection recovery
Can I drive home after a PRP knee injection?
Only drive if you can control the vehicle safely and perform an emergency stop. RAD Clinics generally recommends arranging transport when the treated knee, soreness or restricted movement could affect safe driving.
How long does swelling last after PRP treatment?
Mild swelling often settles within a few days. Contact RAD Clinics if swelling is severe, continues worsening or is associated with spreading redness, heat or fever.
How many PRP injections do I need for knee osteoarthritis?
Some people receive one injection, while others may be advised to have a course. The RAD Clinics recommendation depends on your symptoms, osteoarthritis severity and response to the first treatment.
How long do PRP results last in the knee?
Some patients report improvement lasting six to twelve months or longer, but the response varies. RAD Clinics cannot guarantee a particular duration because outcomes depend on the diagnosis, arthritis severity and rehabilitation.
Can PRP help avoid knee replacement surgery?
PRP may reduce symptoms for some people, but it cannot be relied upon to prevent or permanently delay knee replacement. RAD Clinics will advise when an orthopaedic opinion may be more appropriate.
What should I avoid after a PRP knee injection?
Avoid high-impact exercise, heavy loading and unapproved anti-inflammatory medication during the early recovery period. Follow the specific aftercare and physiotherapy guidance provided by RAD Clinics.
