A meniscus root tear is an injury to the attachment that anchors the meniscus to the shinbone. It can change how the knee spreads load. Evidence about PRP for ordinary degenerative meniscal symptoms does not establish that an injection can reattach a torn root or replace a knee-surgeon assessment.
Why the word "root" changes the conversation
Each knee has two menisci, which help distribute force across the joint. Their roots attach them to bone. A tear at this attachment can allow the meniscus to move outwards, described as extrusion, and reduce its ability to share load. This is different from treating an MRI report as a generic label of "wear and tear".
The Banff Sport Medicine Foundation's 2025 patient review explains why posterior medial root tears can increase the risk of joint degeneration. The important question is the specific tear pattern, the condition of the cartilage and whether a repair or another treatment is appropriate. Age alone does not answer all of those questions.
Contact The Wellness about a knee assessment. Mention if your scan report says "root tear" or "meniscal extrusion" so that the appointment can address that finding.
Symptoms can be less dramatic than expected
Some root tears develop gradually. Others cause a sudden pop or pain at the back or inner side of the knee, sometimes during a squat or an ordinary movement. Being able to walk does not exclude a meniscal injury. Nor does the absence of locking make every root tear unimportant.
These symptoms are not a diagnosis. Arthritis, other meniscal tears and bone injuries can cause overlapping pain. A clinician needs to relate the history and examination to the imaging rather than choosing an injection from symptoms alone.
What the assessment should clarify
Bring the MRI report and, where possible, the actual images. Useful questions include:
- Is the tear at or near the root, and is the meniscus extruded?
- Is there associated cartilage damage or a subchondral bone injury?
- Does leg alignment affect the load through this part of the knee?
- Would a knee surgeon's opinion change the treatment plan?
- What activity and weight-bearing advice applies while waiting?
X-rays can help assess arthritis and alignment. MRI shows the meniscus and other knee structures, but findings still need clinical interpretation. A scan report is one part of the decision, not a complete treatment plan.
Where PRP evidence does, and does not, apply
PRP research includes treatment of meniscal symptoms without surgery and its use alongside a surgical repair. Those are different interventions in different patients. Neither should be presented as proof that a standalone PRP injection restores a detached root's mechanical function.
A 2024 systematic review in the Journal of Orthopaedics and Traumatology included three randomised studies of PRP added to meniscal repair surgery. It reported mixed clinical findings and no significant MRI improvement in the individual studies. Some combined healing measures favoured PRP, but the authors called for more research. These were surgical-repair studies, not evidence that a clinic injection replaces root repair.
If PRP is discussed for coexisting arthritic pain, ask what problem it is intended to treat and how progress will be measured. NICE's knee-osteoarthritis guidance describes limited-quality efficacy evidence and requires special arrangements for governance, consent and audit or research. It does not establish a treatment for a root tear.
Treatment is a decision, not a default package
Options may include rehabilitation, load management, a brace or a surgical opinion, depending on the tear, cartilage, alignment, health and goals. Some people may be considered for root repair; others may be better served by a non-operative plan or treatment directed at arthritis. Do not delay a recommended specialist review while trying a course of injections.
If surgery is considered, ask about restrictions, rehabilitation and the practical effect on work and travel. Repair has a different recovery pathway from simply trimming a damaged fragment. A personalised explanation is more useful than a promise of an immediate return to exercise.
When not to wait for a routine appointment
Seek urgent assessment for a knee that is hot and swollen with fever or feeling unwell, severe sudden pain, inability to bear weight, or a knee that becomes locked and cannot straighten. These need assessment rather than an online assumption that the problem is the meniscus.
Make the next appointment count
Ask for the working diagnosis, the reason for each proposed intervention and the point at which the plan will be reviewed. Confirm the full fee, whether imaging or specialist review is separately charged and what follow-up is included before committing. There is no universal injection course that suits every root tear.
Enquire about a considered knee assessment at The Wellness. Share your report and treatment history, and ask which clinical route is appropriate before booking a procedure.
Sources
- Banff Sport Medicine Foundation. A tear of the medial meniscus posterior root, July 2025
- AAOS OrthoInfo. Meniscus tears
- Utrilla and colleagues. PRP in meniscal repair surgery, 2024 systematic review
- NICE. PRP injections for knee osteoarthritis, HTG497
General information, not a diagnosis or an individual treatment recommendation.