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Professional article · Wound medicine
PRP in wound healing: Potential, evidence and limitations
Platelet-rich plasma contains the patient’s own platelets and signalling molecules involved in tissue repair. This makes PRP biologically interesting. Whether it provides a clinical benefit, however, depends heavily on the type of wound, the cause of impaired healing and the preparation method used.
Why some wounds fail to progress
Wound healing is not a single event. Several biological processes must be coordinated over time.
Most acute wounds close on their own under suitable conditions. Healing becomes more difficult when blood flow is impaired, tissue is exposed to persistent pressure, infection is present or metabolic conditions such as diabetes interfere with repair. Some wounds then remain in an inflammatory state for prolonged periods.
The first question is therefore why a wound is not healing. A biological adjunct cannot compensate for an untreated circulatory disorder, continued pressure or inadequately controlled infection.
Haemostasis
Platelets and the coagulation system form an initial wound seal.
Inflammation
Immune cells remove damaged tissue and respond to potential pathogens.
Proliferation
New blood vessels, matrix components and a new surface covering develop.
Remodelling
The newly formed tissue is structurally reorganised over weeks or months.
In chronic wounds, the surface is only part of the picture.
Vascular status, pressure distribution, signs of infection, comorbidities and previous wound care all belong in the clinical assessment.
What makes PRP biologically interesting
PRP is prepared from the patient’s own blood and contains a higher platelet concentration than the starting blood.
After blood collection, the components are separated by centrifugation. Depending on the system, this produces a plasma fraction with a different composition. Activated platelets can release various signalling proteins, including PDGF, TGF-β and VEGF.
These mediators are involved in cell migration, formation of new blood vessels and development of the extracellular matrix. This supports the hypothesis that PRP may assist individual stages of tissue repair.
This is a biological rationale, not proof of reliable benefit for every wound. The key question is whether the theoretical mechanism translates into consistently better healing under clinical conditions.
PRP is not a standardised single product.
Results from one preparation or application protocol cannot automatically be transferred to other preparations.
How PRP is used in wound care
Application can vary considerably depending on the preparation and treatment concept.
Processed plasma may be applied in liquid form, as a gel, with a wound dressing or as a fibrin-containing preparation. The number of applications and the intervals between them are also not standardised.
Step 1
Identify the cause
Before considering an adjunct, the wound type, blood supply, pressure exposure and possible infection must be assessed.
Step 2
Secure standard wound care
Debridement, an appropriate dressing, pressure offloading and treatment of relevant underlying conditions remain the basis of care.
Step 3
Consider an adjunct
PRP may be considered medically in selected situations. This does not support a general recommendation.
What clinical studies show
The evidence is not uniform. The clearest positive signals so far concern diabetic foot ulcers.
Several systematic reviews report that PRP may be associated with a higher rate of complete wound closure or a shorter healing time than the respective control treatment. However, the included studies differ substantially in their methods.
The largest body of evidence concerns diabetic foot ulcers. Even here, different PRP methods are pooled and the quality of individual studies varies. Positive findings therefore indicate possible potential, not a guaranteed treatment outcome.
Diabetic foot ulcers
Several randomised studies and meta-analyses report positive effects on wound closure or healing time.
positive signal
Venous ulcers
Studies are available, but the evidence is less consistent and insufficient for broad conclusions.
limited
Pressure ulcers
Small, methodologically heterogeneous studies make a robust assessment difficult.
uncertain
Other chronic wounds
Results cannot simply be transferred from one type of wound to another.
case-specific
Statistical improvement and a guideline recommendation are not the same thing.
Guidelines also consider study quality, risk of bias, practical feasibility and the comparability of the procedures used.
Why guidelines remain cautious
A plausible mechanism and positive individual studies do not automatically justify a general recommendation.
International guidelines for diabetic foot ulcers assess autologous platelet procedures in a differentiated manner. Routine use is not recommended for many PRP applications. Certain defined autologous blood products may be considered as an adjunct under specific conditions when guideline-based standard care alone has not been sufficient.
This caution does not necessarily contradict positive meta-analyses. It reflects the need to distinguish a promising research signal from a reliably standardised treatment procedure.
Safety: autologous does not mean free of adverse effects
Because PRP is prepared from the patient’s own blood, the risk of certain intolerance reactions is generally lower. This does not remove all risks.
Possible burdens and adverse effects
Discomfort during blood collection, local pain, bleeding or reactions at the application site may occur. With open wounds, hygienic processing and correct application are particularly important.
What studies suggest so far
Several reviews found no clear increase in adverse events compared with control treatments. The data are nevertheless insufficient to rule out risks for every patient group and every PRP procedure.
Where the evidence reaches its limits
The individual wound and its cause matter more than the general label “PRP therapy”.
For a diabetic foot ulcer, local treatment alone may not be enough. Without adequate pressure offloading, or in the presence of an untreated arterial perfusion disorder, the underlying cause remains. The same applies to infection or repeated mechanical stress.
A further limitation is the lack of standardisation. A preparation with a particular cellular content, defined activation and specific application method is not automatically comparable with another PRP preparation.
A general statement such as “PRP heals wounds” is not scientifically supportable.
A more accurate statement is that there are indications of possible benefit as an adjunct for certain chronic wounds. The strength of the evidence differs according to wound type and protocol.
Technology for professional PRP preparation
Tubes and centrifuge structure the technical preparation process. They do not indicate whether a particular wound will heal better clinically.
For a reproducible PRP workflow, the tube, centrifuge, rotor, adapter and process parameters must be technically compatible. The intended purpose, current instructions for use and the internal procedures of the responsible medical facility remain authoritative.
PRP tube · Article 100101
Vi PRP-PRO
Sterile borosilicate-glass PRP tube for the professional preparation of platelet-rich plasma. The tube contains sodium citrate as an anticoagulant and a thixotropic separation gel for the physical separation of blood components.
- Class IIa medical device, CE 0425
- intended blood draw of approximately 9 ml
- 0.8 ml sodium citrate and biocompatible separation gel
- possible PRP yield approximately 4–4.5 ml; dependent on starting material and process
- technical standard value: 1200 × g for 7 minutes
Medical-device centrifuge · Article 100347
Hettich EBA 200 MD
Compact Class IIa centrifuge for professional use in medical facilities. Run time, speed and RCF can be set on the device.
- Class IIa medical device
- integrated 8-place fixed-angle rotor E3694
- maximum capacity 8 × 15 ml
- for small sample volumes in practices, clinics and laboratories
- RCF, RPM and run time directly adjustable
Do not transfer RPM without checking RCF
For Vi PRP-PRO, the technical standard value is 1200 × g for 7 minutes. For the Hettich EBA 200 MD, a documented rotor radius of 86 mm gives a calculated orientation value of approximately 3,500 rpm. This is not a universal device setting. The rotor, adapter, tube position and actual radius must be checked. The manufacturers’ instructions remain binding. Calculate RCF and RPM.
Product technology and clinical effectiveness must remain separate.
Vi PRP-PRO and the Hettich EBA 200 MD support technical preparation in a professional environment. This does not establish suitability for every wound type or a particular treatment outcome. Indication, application and follow-up remain the responsibility of the treating medical professional.
Frequently asked questions about PRP wound treatment
The main points without broad healing claims.
Can PRP reliably close a chronic wound?
No. Studies show positive signals for some wound types, but a guaranteed outcome cannot be inferred. The cause of the wound, comorbidities and standard wound care have a substantial effect on the course.
For which wounds is the evidence strongest?
The largest body of clinical evidence currently concerns diabetic foot ulcers. The evidence is less robust for venous ulcers, pressure ulcers and other chronic wounds.
Does PRP replace conventional wound care?
No. Appropriate wound care, pressure offloading, infection control and, where necessary, vascular assessment remain the foundation. PRP is considered a possible adjunct.
Is PRP risk-free because it is autologous?
Autologous procedures are not risk-free. In addition to discomfort during blood collection, local reactions, bleeding or application-related complications may occur.
Why do study results differ?
PRP is not prepared using one uniform method. Platelet and leucocyte content, activation, application method and treatment intervals can vary.
Balanced assessment
PRP is a biologically plausible procedure with positive research signals, particularly in chronic diabetic foot wounds. The evidence is weaker for other wound types. Differences in preparation and application protocols prevent a general statement of effectiveness. In selected cases, PRP may be assessed as a medically supervised adjunct; it does not replace appropriate wound care.
Selected professional sources
- Wilkinson HN, Hardman MJ. Wound healing: cellular mechanisms and pathological outcomes. Open Biology. 2020. Full text at PubMed Central
- IWGDF Guidelines on interventions to enhance healing of foot ulcers in people with diabetes, 2023 edition. Guideline PDF
- Systematic reviews and meta-analyses of autologous platelet-rich plasma for chronic wounds and diabetic foot ulcers. Search PubMed
Medical notice:
This article is intended for professional information and describes the current state of scientific discussion. It does not replace examination of a wound, an individual medical assessment or a treatment decision.