If your knee aches along the joint line, clicks, or swells after activity, you may be dealing with a meniscal injury. This guide explains how injections can ease symptoms while you rebuild strength. We compare platelet-rich plasma (PRP), corticosteroid (CS), and hyaluronic acid (HA): what each does, who it suits, how long relief may last, and when a surgical opinion is sensible. You’ll also see how we assess and treat you at RAD Clinics, including ultrasound-guided injections and a clear follow-up plan so you know exactly what to expect.
What is a meniscal injury?
Your knee has two shock-absorbing pads, menisci made of fibrocartilage. A meniscal injury is a tear or degeneration of the medial (inner) or lateral (outer) meniscus. Tears disrupt load-sharing, can irritate the joint lining (synovium), and trigger pain or mechanical symptoms. Injections help symptoms, but they do not repair the tear itself.
What are the signs of meniscal injury?
Joint-line pain and tenderness
- Swelling after activity
- Clicking, catching or “giving way” (sometimes locking)
- Pain with twisting or deep knee bend
- Positive McMurray/Thessaly test on examination (helpful but imperfect; accuracy is moderate).
What are common meniscal injuries?
- A sudden twist under load (sports pivot, awkward landing)
- Gradual wear with osteoarthritis (OA), age, or higher body weight
- Root or radial tears due to overload and alignment issues
- After partial meniscectomy (more contact stress in the joint)
Where do injections fit in meniscal tear treatment?
Think of injections as pain-and-inflammation control that lets you get back to rehab and load management. They do not stitch together the meniscus in cases of a full tear resulting from a meniscal injury.
If you have true locking, major root tears, or you fail good conservative care, a surgical opinion may be appropriate.
Which injection works best for meniscal symptoms?
What helps depends on what’s causing your pain, how long it’s been there, and whether you want quick relief or longer-lasting results. A corticosteroid (CS) injection is best when the knee is hot and swollen. Hyaluronic acid (HA) can help knees with osteoarthritis (OA) that feel stiff or creaky by helping the joint move more smoothly. Platelet-rich plasma (PRP) may support the body’s healing signals and can give longer relief in wear-and-tear problems.
PRP, Corticosteroid, and Hyaluronic Acid — side by side
| Feature | Platelet-Rich Plasma (PRP) | Corticosteroid (CS) | Hyaluronic Acid (HA) |
|---|---|---|---|
| Primary target | Biologic modulation & anti-inflammatory signalling | Synovitis suppression | Lubrication & shock absorption (viscosupplement) |
| Typical onset | 2–6 weeks | 2–7 days | 1–3 weeks |
| Typical duration | 3–12 months (variable) | 4–8 weeks (short-term) | 3–6 months (variable) |
| Best for | Degenerative tears with mild–moderate OA or persistent symptoms after rehab | Hot, swollen flare with painful effusion | OA-type stiffness/crepitus with activity pain |
| Evidence snapshot | For knee OA, PRP often outperforms HA for pain/function in meta-analyses; meniscal-specific data promising but mixed | Short-term benefit; effect modest and transient | Conditional in some guidelines; useful in selected patients |
| Dosing | 1–3 injections | Usually single injection | 1–3 injections (product-dependent) |
| Key cautions | Post-injection flare; rare adverse events | Limit repeats; caution with diabetes/infection | Avoid in product allergy; caution with large effusions |
| Repairs tear? | No | No | No |
Is a cortisone injection for a torn meniscus useful?
Yes, for short-term relief. A corticosteroid injection can reduce synovitis and joint effusion, giving you a quieter window to strengthen and retrain. It does not heal the tear, and benefits usually last weeks, not months.
When is PRP indicated for meniscal tear symptoms?
Consider PRP if you have a degenerative meniscal tear with mild–moderate OA, or if symptoms persist after a solid rehab program. Expect delayed onset (2–6 weeks) but potentially longer relief; combine with progressive strengthening and load control. Evidence in meniscal-specific cohorts is promising yet mixed, so we set realistic goals and track outcomes.
When is hyaluronic acid indicated?
Hyaluronic Acid suits knees where OA-type stiffness/crepitus and activity pain dominate alongside a degenerative tear, especially if a steroid is contraindicated or you need relief beyond a few weeks. Guideline positions vary; patient selection matters.
Who should avoid each injection?
- Corticosteroid (CS): avoid frequent repeats; caution in poorly controlled diabetes or any infection.
- PRP: avoid with certain platelet disorders, unmanaged anticoagulation, or active infection.
- Hyaluronic Acid: avoid if allergic to product components; be cautious with large effusions (often aspirated first).
How is a meniscal injury diagnosed before injection?
We combine history and examination with targeted imaging. Clinical tests (e.g., McMurray, Thessaly) help but aren’t perfect. Magnetic Resonance Imaging (MRI) confirms tear type/pattern when needed. We also use ultrasound to evaluate effusion/synovitis and to guide injections. Ultrasound guidance increases injection accuracy across portals.
How do you choose the right meniscal tear injection?
- Hot, swollen knee with night pain: Corticosteroid injection for fast anti-inflammatory relief.
- Degenerative tear + mild OA with rehab plateau: PRP for longer-term improvement.
- Stiff, creaky OA-type knee pain: Hyaluronic acid (HA) for viscoelastic support.
- Mechanical locking or true giving-way: Seek a surgical opinion before considering injections.
We personalise these decisions at RAD Clinics after a full assessment.
What outcomes should you expect after injection?
- Pain reduction so you can strengthen and retrain within 1–3 weeks (CS/HA) or 2–6 weeks (PRP)
- Best results when you stick with rehab and optimise weight/sleep/load
- Remember: no injection repairs a tear. Injections buy a window to heal around the tear.
How RAD Clinics delivers meniscal tear injections
At RAD Clinics, your care is calm, precise, and transparent:
- Assess – Focused history, joint‑line tests, and ultrasound to check for synovitis/effusion; MRI when it will change management.
- Decide – Match the injection to your symptom driver (flare vs OA stiffness vs degenerative persistence).
- Deliver – Ultrasound‑guided knee injections for accuracy and comfort.
- Rehab – Practical loading advice and a tailored strengthening pathway (we’ll coordinate with your physiotherapy provider if you already have one).
- Review – Follow‑up at 4–12 weeks to monitor progress and, if needed, adjust the plan.
Key Takeaways
- Injections treat symptoms, not the structural tear.
- Corticosteroid: fastest onset, shortest duration, ideal for flares.
- PRP: slower onset, often more durable relief in osteoarthritis; meniscal‑specific evidence is mixed but promising in selected patients.
- Hyaluronic Acid: supports viscoelastic mechanics with variable guideline support, for use in carefully selected OA‑dominant knees.
- Ultrasound guidance improves injection accuracy.
Common Questions About Foreign Bodies
How to tell if your meniscus is torn?
A meniscus tear typically causes joint line pain, swelling, clicking, or locking that worsens with twisting or deep squatting. Clinicians confirm a meniscal injury using examination tests like McMurray or Thessaly and, when required, an MRI.
Do meniscus tears heal on their own?
Meniscus tears in the outer vascular zone sometimes heal with rest and rehabilitation. Tears in the inner avascular zone rarely heal, so persistent pain, swelling, or mechanical symptoms justify image-guided treatment or surgical evaluation.
How to differentiate collateral ligament and meniscal injury
Collateral ligament injury produces pain on side stress with focal tenderness along the ligament, often without locking. Meniscal injury produces joint line pain, catching or locking, and pain on deep flexion or twisting; examination and MRI distinguish the diagnosis.
- Collateral ligament injury: valgus or varus stress pain, localised tenderness, extra-articular swelling.
- Meniscal injury: joint line tenderness, mechanical symptoms, positive McMurray or Thessaly.
What speeds up meniscus recovery?
Targeted physiotherapy that restores range, strengthens quadriceps and hamstrings, and improves neuromuscular control speeds meniscus recovery. Load management, adequate sleep, weight control, and avoiding pivoting or deep squats early further reduce symptoms and improve function.
References
- Khalid S, et al. Comparative effectiveness of intra‑articular therapies in knee osteoarthritis: a meta‑analysis comparing PRP with other treatment modalities. Annals of Medicine & Surgery. 2023.
- Tang JZ, et al. Platelet‑rich plasma versus hyaluronic acid in the treatment of knee osteoarthritis: a PRISMA systematic review and meta‑ Journal of Orthopaedic Surgery and Research. 2020.
- Bottomley J, et al. Diagnostic Accuracy of Magnetic Resonance Imaging in Meniscal Tears. Cureus. 2025.
- El Zouhbi A, et al. Utility of Platelet‑Rich Plasma Therapy in the Management of Meniscus Injuries: A narrative review. Orthopedic Reviews. 2024.
