The main clinical applications of platelet rich fibrin injections are in oral and maxillofacial surgery, orthopedic and sports medicine, chronic wound care, and aesthetic dermatology. In each setting, PRF is used for the same reason: it concentrates a patient’s own platelets and white cells inside a fibrin scaffold that releases growth factors slowly at the site of injury. It is a supportive, healing-oriented therapy rather than a cure, and the strength of the evidence varies a great deal from one use to the next.
My interest in PRF comes from the hematological side of the story. Platelets are usually thought of as clotting cells, but they are also small packages of signalling molecules. Below, I explain what platelet rich fibrin is, where it is used, how it compares with PRP, and what a patient can realistically expect.
What Is Platelet Rich Fibrin?
Platelet rich fibrin (PRF) is a second-generation platelet concentrate. It is made from a small sample of the patient’s own blood, spun in a centrifuge without any added anticoagulant. As the blood begins to clot naturally during the spin, a fibrin network forms and traps platelets and leukocytes (white blood cells) within it.
Its predecessor, platelet rich plasma (PRP), is prepared with an anticoagulant and sometimes activated with additives before use. PRF skips those steps, which is why it is often described as a more “natural” concentrate. For a wider look at the regenerative concept, see our article on PRF as an innovative approach in regenerative medicine.
Forms of PRF
- Solid PRF (L-PRF): a gel-like clot that can be pressed into a membrane and placed directly into a surgical site.
- Advanced PRF (A-PRF): prepared with modified spin settings intended to keep more cells within the clot.
- Injectable PRF (i-PRF): a liquid form produced with a shorter, gentler spin, drawn into a syringe before it clots, so it can be injected into joints, tendons, or skin.
How PRF Works in the Body
When platelets are activated, they release growth factors stored in their granules. The best known include platelet-derived growth factor (PDGF), transforming growth factor-beta (TGF-β), and vascular endothelial growth factor (VEGF). Together they attract repair cells, encourage new blood vessel formation, and support the laying down of new tissue.
The fibrin mesh matters as much as the platelets. Rather than releasing everything in a single burst, the scaffold lets growth factors trickle out over several days. It also acts as a physical framework that repair cells can migrate along. PDGF in particular has wide roles in vessel and tissue biology, which we cover in PDGF in vascular biology and disease.
Key Clinical Applications of Platelet Rich Fibrin Injections
PRF has spread from its origins in dental surgery to several other specialties. The table below summarizes the main uses and how established each one is.
| Field | Typical uses | Form commonly used | Evidence maturity |
|---|---|---|---|
| Dental and oral surgery | Extraction sockets, implant sites, sinus lifts, gum grafting | Solid membranes and plugs | Most established |
| Maxillofacial surgery | Bone grafting, soft tissue repair | Solid PRF mixed with graft material | Moderate |
| Orthopedics and sports medicine | Tendinopathy, ligament injury, knee osteoarthritis | Injectable PRF | Emerging |
| Wound care | Chronic ulcers, diabetic foot wounds | Solid membranes applied topically | Emerging |
| Dermatology and aesthetics | Skin rejuvenation, acne scars, hair thinning | Injectable PRF | Early and variable |
| Other surgical fields | Adjunct in selected plastic and ENT procedures | Solid or injectable | Limited |
Dentistry and Oral Surgery
This is where PRF has the longest track record. Surgeons place PRF membranes into tooth extraction sockets to support soft tissue closure and bone fill, and use them around dental implants and during sinus lift procedures. Many patients report less discomfort after extractions, although results depend heavily on technique.
Orthopedics and Sports Medicine
Injectable PRF is used for tendinopathy (such as tennis elbow or Achilles problems), partial ligament injuries, and knee osteoarthritis. The aim is to reduce pain and support tissue repair. It is often combined with physical therapy, and in some centers it is used alongside procedures such as bone grafting or cartilage repair surgery.
Wound Healing
For chronic wounds that have stalled, such as diabetic foot ulcers or venous leg ulcers, PRF membranes can be applied directly to the wound bed. They do not replace the basics of wound care, including pressure offloading, infection control, and good blood supply.
Dermatology and Hair
Aesthetic clinics use i-PRF for skin texture, acne scarring, under-eye hollowing, and some forms of hair thinning. This is the area where marketing tends to run ahead of evidence, so expectations should be modest.
PRF Versus PRP: What Is the Difference?
Patients often ask which is better. The honest answer is that they are close relatives with different handling properties, and head-to-head comparisons are still limited.
- Additives: PRF uses no anticoagulant; PRP does.
- Release profile: PRF releases growth factors more gradually because of its fibrin scaffold.
- White cells: PRF typically retains more leukocytes, which may help with local defense and healing.
- Preparation: PRF is quick and inexpensive, but it must be used promptly before the sample clots.
The Procedure: What Patients Can Expect
- Assessment: the clinician confirms the diagnosis, often with ultrasound or MRI for joint and tendon problems.
- Blood draw: a small volume of blood is taken from the arm, similar to a routine blood test.
- Centrifugation: the tubes are spun for a short time to separate the PRF layer.
- Application: the PRF is injected or placed at the target site under sterile conditions, sometimes with ultrasound guidance.
- Aftercare: short-term soreness is common; a rehabilitation or wound-care plan usually follows. Some conditions need more than one session.
Because PRF comes from the patient’s own blood, allergic reactions and disease transmission are not expected. The main risks relate to the injection itself: pain, bruising, swelling, and, rarely, infection.
Who Should Be Cautious
From a hematology point of view, PRF depends on having healthy, adequate platelets. People with very low platelet counts, significant platelet function disorders, or active blood cancers may not produce a useful concentrate. Anyone taking anticoagulants or antiplatelet drugs should discuss this beforehand, and PRF is generally avoided at sites of active infection or cancer.
Standardization is the field’s biggest challenge. Centrifuge settings, tube types, and injection volumes differ from clinic to clinic, which makes results hard to compare. Larger, well-designed trials are still needed for many of the newer uses.
Key Takeaways
- PRF is an autologous platelet concentrate made without anticoagulants.
- Its strongest evidence is in dental and oral surgery; orthopedic, wound, and skin uses are still developing.
- It works through slow growth factor release from a fibrin scaffold.
- It is an adjunct to standard care, not a replacement for it.
- People with platelet or bleeding disorders should speak with a hematologist first.
Frequently Asked Questions
Is PRF the same as PRP?
No. Both are made from your own blood, but PRF is prepared without anticoagulant and forms a fibrin scaffold. That gives it a slower, more sustained release of growth factors than PRP.
Are PRF injections painful?
Most people feel a sting from the injection and some soreness for a day or two afterward. For joint or tendon injections, local anesthetic or ultrasound guidance can make the procedure more comfortable.
How many PRF sessions will I need?
It depends on the condition. Dental uses usually involve a single application during surgery, while tendon, joint, and skin treatments are often given as a short series spaced several weeks apart.
Can I have PRF if I have a blood disorder?
Possibly, but you need an individual assessment. A low platelet count or a platelet function problem can reduce the quality of the concentrate and raise bleeding risk at the injection site.
