GAE vs Steroid Injections vs PRP — Which Knee Pain Treatment Actually Works?
Three Treatments, Three Different Mechanisms — And One Question Every Patient Asks
When knee osteoarthritis reaches the stage where physiotherapy and oral medication are no longer providing adequate relief, patients in Lahore are typically offered one of three interventional treatment options — steroid injections, platelet-rich plasma therapy, or genicular artery embolization. Each is described as an effective treatment for knee pain. Each works through a completely different biological mechanism. And each suits a different patient profile, a different stage of disease, and a different set of clinical circumstances.
The question patients most commonly ask — which one actually works — does not have a single answer. The better question is which one works for which patient, at which stage of their condition, and for how long. At Alnoor Diagnostic Centre in Shadman, Lahore, we provide both the advanced knee imaging that guides these treatment decisions and the interventional radiology services that make GAE available to appropriate patients across the city.
Steroid Injections — Fast Relief With Important Limitations
Corticosteroid injections into the knee joint are the most widely used interventional treatment for osteoarthritis pain in Lahore and across Pakistan. Corticosteroids are powerful anti-inflammatory agents that suppress the inflammatory cascade within the synovium rapidly and effectively. When delivered directly into the joint under image guidance, they reduce synovial swelling, decrease production of cartilage-degrading enzymes, and provide pain relief that most patients notice within days.
The clinical reality of steroid injections is well established and straightforward — they work well but for a limited period. Most patients experience meaningful pain relief lasting four to twelve weeks. Some benefit for longer. Some respond less well. When the steroid effect wears off, the underlying inflammatory process resumes because nothing has been done to address its structural cause — the abnormal blood vessels sustaining chronic synovitis.
Repeated steroid injections carry a genuine risk of cartilage damage with each successive administration. Evidence consistently shows that frequent steroid injections — more than three or four per year — accelerate cartilage degradation rather than protecting the joint. This means that while steroid injections are appropriate as a short-term measure or as a bridge toward another treatment, using them repeatedly as a long-term pain management strategy is both clinically limited and potentially harmful to the joint.
Steroid injections are most appropriate for patients with acute inflammatory flares requiring rapid relief, those awaiting a more definitive procedure, or patients in whom other treatments are contraindicated. Image guidance — ultrasound or fluoroscopy — significantly improves accuracy and outcomes compared to blind landmark-guided injection.
Platelet-Rich Plasma — Biological Repair With Growing Evidence
Platelet-rich plasma — PRP — represents a more biologically sophisticated approach to knee pain management. The treatment uses the patient’s own blood as its source. A blood sample is taken, centrifuged to concentrate the platelet fraction, and the resulting platelet-rich preparation is injected directly into the knee joint under image guidance.
Platelets contain concentrated growth factors — including platelet-derived growth factor, transforming growth factor-beta, and vascular endothelial growth factor — that are naturally involved in tissue repair. When delivered into an arthritic knee, these growth factors stimulate cartilage cell activity, modulate the inflammatory environment, and support regenerative processes within the joint. The goal of PRP is not merely to suppress inflammation temporarily but to support biological repair of the joint environment.
Clinical evidence for PRP in knee osteoarthritis has grown substantially in recent years. Multiple clinical studies demonstrate that PRP provides superior pain relief and functional improvement compared to steroid injections when assessed at six and twelve months, and that its benefits are more durable — typically lasting six to eighteen months in responding patients. It does not accelerate cartilage degradation as repeated steroids do, making it a safer option for repeated administration.
PRP is most appropriate for patients with mild to moderate osteoarthritis where cartilage and joint structure are still largely preserved, and where the biological repair environment within the joint can still respond meaningfully to growth factor stimulation. In advanced disease with severe cartilage loss, the regenerative potential is more limited and the benefits less predictable.
The main limitation of PRP is variability — the concentration and composition of growth factors in the final preparation varies between patients and between preparation methods, making standardisation challenging. Response rates are high in well-selected patients but not universal.
Genicular Artery Embolization — Addressing the Root of Inflammatory Pain
Genicular artery embolization — GAE — works through a mechanism that is fundamentally different from both steroids and PRP. Rather than suppressing inflammation with medication or stimulating repair with growth factors, GAE addresses the vascular infrastructure that sustains chronic synovial inflammation in the first place.
In osteoarthritic knees, abnormal new blood vessels form within the inflamed synovium — a process called neovascularisation. These vessels are structurally abnormal and leaky, and they are accompanied by pain-transmitting nerve fibres. They feed and maintain the inflammatory environment continuously. GAE uses microcatheter-delivered microsphere particles to selectively block these abnormal vessels under fluoroscopic guidance, interrupting the blood supply that sustains synovitis at its source.
Because GAE addresses the vascular driver of inflammation rather than simply suppressing its output, its effects are more durable than steroid injections. Clinical studies report meaningful pain reduction in the majority of appropriately selected patients, with benefits persisting in many cases for one to three years. Unlike steroids, it does not damage cartilage. Unlike PRP, its mechanism does not depend on the regenerative capacity of a joint that may already be significantly compromised.
GAE is most appropriate for patients with moderate osteoarthritis and active synovial inflammation who have not responded adequately to injections and who are not yet candidates for or not ready for knee replacement. It is particularly valuable for patients whose medical comorbidities make surgical procedures high risk, and for those who wish to delay replacement while maintaining quality of life.
The procedure requires arterial access, fluoroscopic guidance, and microcatheter skills that are available only in a specialist interventional radiology facility — which is why it remains less widely available than steroid or PRP injections despite its clinical advantages.
Choosing the Right Treatment — What the Evidence Suggests
For acute inflammatory flares and short-term relief, steroid injections remain appropriate. For mild to moderate osteoarthritis where biological repair is the goal and durability is a priority, PRP offers superior sustained benefit over steroids with a safer side effect profile. For patients with moderate osteoarthritis and active synovitis who have failed injections and require durable relief without surgery, GAE provides the most targeted and sustained pain reduction available outside of joint replacement.
These treatments are not mutually exclusive. A rational treatment pathway for many patients involves steroid injection for acute control, PRP for biological management during the moderate disease phase, and GAE when the inflammatory burden has become the dominant pain driver and prior injections are no longer providing adequate duration of relief. Accurate MRI imaging determines which treatment is most appropriate at each stage by identifying the specific biological and structural characteristics of the individual patient’s knee.
Imaging and Interventional Radiology at Alnoor Diagnostic Centre, Lahore
At Alnoor Diagnostic Centre in Shadman, Lahore, we provide advanced knee MRI for accurate treatment selection alongside image-guided injections and GAE performed by our experienced interventional radiology team. Every treatment decision at our centre is supported by the highest quality diagnostic imaging.