PRP Procedures

For Medical Students

What It Shows

Platelet rich plasma is prepared from the patient's own blood and injected into a target, usually a tendon. 5.4.6 covers the patellar tendon.

Ultrasound identifies the target, guides the needle and confirms the delivery. 5.4.16 covers the knee injection.

It matters because the imaging contribution here is accurate delivery, and whether the preparation works is an active controversy owned by Section 6. 5.1.7 covers evidence based imaging.

How It Is Acquired

Scan the target first to confirm the abnormality is where the symptoms are. 5.4.6 covers the patellar tendon.

Choose intratendinous or peritendinous delivery according to the protocol being followed, and know which was intended. 5.4.20 covers tendon procedures.

Keep the needle in plane and confirm the tip in the target. 5.2.8 covers reflection.

Watch the delivery, since the spread is the confirmation. 5.4.16 covers the knee injection.

Record the target, the approach and the delivery confirmation. 5.20.1 covers structured reporting.

What Normal Looks Like

A needle visible in plane with its tip in the intended tissue. 5.2.8 covers reflection.

Injectate appearing in the intended location.

A target whose appearance matches the clinical problem. 5.4.6 covers the patellar tendon.

A documented approach that another operator could repeat. 5.20.1 covers structured reporting.

What Abnormal Looks Like

A needle out of plane, making the delivery location unknown. 5.2.8 covers reflection.

Injectate appearing outside the intended tissue. 5.4.16 covers the knee injection.

An intratendinous delivery where a peritendinous one was intended, or the reverse. 5.4.20 covers tendon procedures.

A target whose appearance does not match the symptoms, which should prompt a pause rather than a procedure. 5.1.6 covers imaging pitfalls.

MRCS Level

How It Is Acquired

In a viva the expected answer states what imaging contributes and declines to settle the efficacy question.

The expected points are the target confirmation, the delivery choice, the in plane needle, the delivery confirmation, and the record.

Say that the imaging establishes delivery and not benefit. 5.1.7 covers evidence based imaging.

Say that the efficacy evidence is contested and belongs elsewhere. 5.1.7 covers evidence based imaging.

Say that the target should match the symptoms before anything is injected. 5.1.6 covers imaging pitfalls.

What Abnormal Looks Like

The reasoning expected is that the imaging question here is identical to any other guided injection, so everything from the needle pages applies unchanged. 5.4.16 covers the knee injection.

What differs is that the preparation's own effect is unsettled, which makes the accuracy of delivery a necessary condition for any trial rather than a benefit in itself. 5.1.7 covers evidence based imaging.

Delivery location is also a variable between protocols, so two procedures with the same name differ in where the material went. 5.4.20 covers tendon procedures.

That makes recording the delivery location part of the procedure rather than administrative, because otherwise the procedure cannot be compared with anybody else's. 5.20.1 covers structured reporting.

How Good It Is

Ultrasound delivers the preparation accurately and contributes nothing to whether it should be delivered.

Its best contribution is reproducible delivery to a documented location, which is what makes a protocol a protocol. 5.20.1 covers structured reporting.

It is limited absolutely on the efficacy question, which is a treatment matter and is contested. 5.1.7 covers evidence based imaging.

No figures appear for accuracy on this page, under decision 028, and no outcome or preparation figures appear either: platelet concentrations, volumes and response rates are published quantities this environment cannot check, and the efficacy claim is not this section's to make.

FRCS Level

How Good It Is

At decision level the imaging contribution is delivery and documentation, and the decision sits outside this section.

A documented target and delivery location make the procedure repeatable and auditable, which is the minimum any protocol needs. 5.20.1 covers structured reporting.

Confirming the target matches the symptoms before injecting prevents treating an incidental appearance. 5.1.6 covers imaging pitfalls.

A tendon with a discrete tear is a different target from a tendinopathic one, and the distinction is an imaging one. 5.4.5 covers the quadriceps tendon.

Whether to offer the procedure at all is a treatment decision this section does not own. 5.1.3 covers choosing the correct investigation.

Where It Misleads

The commonest error is injecting an incidental imaging appearance. 5.1.6 covers imaging pitfalls.

The delivery location is not recorded, so the procedure is not comparable. 5.20.1 covers structured reporting.

The needle is out of plane and the delivery location is assumed. 5.2.8 covers reflection.

An accurate delivery is reported as a successful treatment. 5.1.7 covers evidence based imaging.

A discrete tear is treated as tendinopathy. 5.4.5 covers the quadriceps tendon.

Fellowship Level

Where It Misleads

At fellowship level this is the page where the boundary between imaging and treatment matters most, and this section stays on its side of it.

The imaging is straightforward and settled, and the treatment's efficacy is contested, so an imaging page that implied otherwise would be making a claim outside its competence. 5.1.7 covers evidence based imaging.

Preparation protocols differ in platelet concentration, leucocyte content, volume and delivery location, which is part of why the trial evidence is hard to reconcile, and only the last of those is an imaging variable. 5.4.20 covers tendon procedures.

Because the appearance being treated occurs in asymptomatic tendons, the target selection itself is a weak point independent of the preparation. 5.4.6 covers the patellar tendon.

The imaging's most useful contribution may be the pre-procedure scan that finds a different explanation, and that contribution is rarely recorded as an outcome. 5.1.6 covers imaging pitfalls.

The position this page takes is that guidance makes the delivery reproducible, that reproducibility is a precondition for answering the efficacy question, and that the answer is not here. 5.1.3 covers choosing the correct investigation.