Patellar Tendinopathy in NYC: Why PRP Is Changing How We Treat Jumper's Knee
Patellar tendinopathy—commonly called jumper's knee—is a degenerative condition of the patellar tendon that causes anterior knee pain below the kneecap. It is notoriously difficult to treat with conventional approaches, and it affects a wide range of patients: from competitive basketball and volleyball players to weekend warriors and individuals who developed it gradually from repetitive loading.
At Regen Health Physicians NYC, PRP (Platelet-Rich Plasma) therapy has become a central tool in our approach to patellar tendinopathy, and for good reason: the pathophysiology of tendinopathy makes it an ideal target for growth factor-based regenerative therapy.
Understanding the Pathophysiology
Patellar tendinopathy is not primarily an inflammatory condition—it is a degenerative one. The term "tendonitis" is now considered a misnomer. Biopsy studies of affected tendons consistently show:
- Disorganized collagen architecture
- Neovascularization (abnormal blood vessel ingrowth)
- Absence of classic inflammatory cells
- Increased tenocyte apoptosis
This matters for treatment: anti-inflammatory strategies (NSAIDs, corticosteroids) that target inflammation are largely ineffective because inflammation isn't the core problem. What's needed is tissue regeneration—and that's precisely what PRP delivers.
How PRP Treats Patellar Tendinopathy
PRP is derived from the patient's own blood, centrifuged to concentrate platelets and their associated growth factors: PDGF, TGF-β, VEGF, IGF-1, and others. When injected into degenerative tendon tissue under ultrasound guidance, these growth factors:
- Stimulate tenocyte proliferation and collagen synthesis
- Promote reorganization of collagen fibril architecture
- Modulate neovascularization
- Suppress the apoptotic signals driving cell death in affected tissue
The result is actual tissue repair—not just symptom suppression.
What the Evidence Shows
Multiple randomized controlled trials support PRP for patellar tendinopathy. A landmark 2013 study found PRP injection superior to dry needling at 6-month follow-up in athletes with chronic patellar tendinopathy. A 2021 systematic review concluded that PRP provides meaningful improvements in pain and function, particularly in patients with chronic tendinopathy who have failed conservative management.
PRP also compares favorably to:
- Corticosteroid injections: Short-term relief but accelerated tendon degeneration with repeated use
- Prolotherapy: Less growth factor concentration than PRP
- Surgery: PRP avoids surgical risks and prolonged recovery
The Treatment Protocol at RHPNY
At RHPNY, our patellar tendinopathy protocol includes:
- Diagnostic ultrasound: Confirms tendinopathy, evaluates degree of degeneration, and guides injection
- PRP preparation: Leukocyte-rich PRP (LR-PRP) preferred for tendon indications—higher leukocyte content supports tissue repair
- Image-guided injection: All injections performed under ultrasound guidance for precision
- Post-injection rehabilitation: Structured eccentric loading program (validated first-line rehab for tendinopathy) commences 1-2 weeks post-injection
- Follow-up: Repeat ultrasound at 6-8 weeks to assess tissue response; second injection if indicated
Most patients with chronic patellar tendinopathy require 2-3 PRP sessions, spaced 6-8 weeks apart.
Who Is a Good Candidate?
PRP is most appropriate for patients with:
- Patellar tendinopathy confirmed by ultrasound or MRI
- Failure of eccentric exercise protocol (minimum 3 months)
- Failure of physical therapy and load management
- Desire to avoid surgery
We also evaluate patients with acute tendon tears and partial ruptures for regenerative medicine approaches on a case-by-case basis.
If anterior knee pain is limiting your activity or your sport, book a consultation to determine whether PRP is the right next step in your treatment plan.
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This article is for informational purposes only and does not constitute medical advice. All treatments should be evaluated on a case-by-case basis by a qualified physician.
