Are You a Good Candidate for PRP in Your Knee? Here Are 5 Red Flags

Platelet-rich plasma (PRP) injections have gained popularity as a non-surgical treatment for knee pain. From ACL tears to severe arthritis, PRP can provide relief and even long-term improvement. However, not everyone is an ideal candidate. If you’re considering PRP inyour knee, here are the top five reasons you may want to rethink—or at least consult carefully—before moving forward.

1. Recurrent Swelling or Baker’s Cyst

Fluid accumulation in the knee can limit the effectiveness of PRP. Two common problem areas are:

• Above the kneecap
• Behind the knee (Baker’s cyst)

If these areas have required repeated drainage, PRP may not work as intended. Persistent fluid often indicates damage too severe for regenerative therapy.

2. Loose Bodies in the Knee

Loose bodies are small fragments of cartilage or bone floating inside the knee joint. They can cause pain, locking, and discomfort. Injections won’t dissolve these fragments—you’ll likely need arthroscopic surgery first. After removal, PRP could still be an option.

3. Bucket-Handle or Root Meniscus Tears

A bucket-handle tear splits the C-shaped meniscus into two pieces, while a root tear involves the back of the meniscus and leads to joint instability. These injuries rarely heal on their own or with PRP. Surgical repair is usually required before considering regenerative therapy.

4. Complete ACL Tear

If your ACL is fully torn and the ends are not connected, PRP alone won’t repair it. However, partial tears may respond well to PRP or bone marrow aspirate concentrate (BMAC).

5. Severe Arthritis in All Knee Compartments

PRP can improve pain and function in one or two compartments of the knee, even with advanced arthritis. But when all three compartments show grade four arthritis, results may be limited. Managing expectations is key, and surgical options might be necessary.

Age Isn’t a Limiting Factor

Your age does not automatically disqualify you from PRP. The determining factor is whether your knee’s structural issues make you a good candidate. Many patients over 40 still experience significant improvement without surgery.

Why PRP or BMAC Might Be Better Than Knee Arthroscopy

PRP and BMAC procedures are minimally invasive, with faster recovery times than surgery. Unlike arthroscopy, which mainly removes damaged tissue, regenerative injections target the health of cartilage, ligaments, tendons, and bone. Treatments involve multiple injection sites around the knee, including areas arthroscopy can’t reach.

This approach can reduce pain and restore function while allowing you to return to activities like biking, swimming, tennis, and golf sooner than traditional surgery.

Is PRP Right for You?

If none of the five red flags apply to you, PRP or BMAC may be an effective solution for your knee pain—even if you have swelling inside the bone marrow (bone bruise). Consulting with a regenerative medicine specialist is the best way to determine your eligibility and expected outcomes.

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