Evidence behind this recommendation.
Selected studies from our library that inform the recommendations on this page. Evidence grade shown when available.
What Is Patellar Tendinopathy?
Patellar tendinopathy (popularly known as "jumper's knee") is a degeneration of the patellar tendon, which connects the patella to the tibial tuberosity. It results from overload of repetitive tensile loads that exceed the tendon's repair capacity, resulting in angiofibroblastosis — collagen degeneration with disorganized vascular proliferation.
It is extremely prevalent in sports involving jumping, sprinting, and rapid changes of direction: volleyball, basketball, soccer, and track and field. It mainly affects athletes aged 15 to 35 and may become chronically disabling without adequate treatment. Pain typically localizes to the proximal portion of the tendon (inferior pole of the patella) and worsens when descending stairs, squatting, and during the first minutes of activity.
As in lateral epicondylitis, the substrate is not acute inflammatory — it is degenerative. For this reason, NSAIDs are of limited long-term effectiveness, and dry needling, which stimulates fibroblasts, is the most rational intervention.
Young Athletes
Prevalence of up to 45% in elite volleyball players. It is the most common tendinopathy in jumping sports.
Degeneration, Not Inflammation
The histological substrate is angiofibroblastosis — disorganized collagen, not inflammatory infiltrate. NSAIDs are of limited effectiveness.
Adjuvant Potential of Needling
Experimental studies suggest that the controlled microlesion of dry needling may recruit fibroblasts and growth factors — a hypothesis consistent with the biological model, with still moderate clinical evidence.
Why Are Conventional Treatments Not Always Sufficient?
Rest alone rarely resolves patellar tendinopathy — without adequate mechanical stimulus, degenerated collagen is not replaced by healthy collagen. NSAIDs control pain temporarily without modifying the degenerative process. Corticosteroids, although fast-acting, weaken the tendon and increase the risk of rupture with repeated applications.
Eccentric quadriceps exercises are the most effective long-term conservative treatment, but they are painful in the early phases and require high adherence for 8 to 12 weeks. Dry needling can be the "catalyst" that accelerates biological healing and allows exercises to be performed with less pain.
TREATMENTS FOR PATELLAR TENDINOPATHY
| TREATMENT | MECHANISM | LONG-TERM EFFICACY |
|---|---|---|
| Rest alone | Cessation of damage | Limited (no biological stimulus to repair) |
| NSAIDs | Anti-inflammatory | Limited (tendinopathy is not classically inflammatory) |
| Corticosteroids | Potent anti-inflammatory | Transient relief + risk of rupture described with repetition |
| Eccentric exercises | Mechanical stimulus to collagen | High (best-supported conservative standard) |
| Dry needling + eccentrics | Biological + mechanical | Trials suggest additional benefit compared with rehabilitation alone |
How Does Medical Acupuncture Work in Patellar Tendinopathy?
One of the central mechanistic hypotheses is the controlled microlesion in degenerated tendon tissue. The needle penetrates the angiofibroblastosis region at the inferior pole of the patella, creating a localized microtrauma. Experimental studies suggest that this minimal lesion can reactivate part of the biological repair processes that tend to become inefficient with chronicity.
Experimental models describe that minimal capillary bleeding activates platelets, releasing growth factors (such as TGF-beta and PDGF) that may recruit fibroblasts and promote production of more organized collagen. Low-frequency electroacupuncture is being investigated as a way to enhance this local angiogenic response — plausible pathways still being consolidated in clinical research.
Cascade of Tendon Repair by Needling
Precise needling at the inferior pole of the patella
The needle penetrates the angiofibroblastosis region at the proximal patellar tendon, creating a controlled microlesion.
Platelet activation and primary hemostasis
Minimal capillary bleeding activates the coagulation cascade and releases growth factors TGF-beta and PDGF.
Fibroblast recruitment
Healthy fibroblasts migrate to the site and begin deposition of organized type I collagen.
Localized angiogenesis
Formation of new capillaries (angiogenesis) improves perfusion of a chronically hypovascular region.
Reorganization of the extracellular matrix
With additional mechanical stimulus (eccentric exercises), the new collagen aligns with the tensile forces of the tendon.
What Do the Scientific Studies Say?
Studies on dry needling in patellar tendinopathy show encouraging results, especially when combined with eccentric exercises. Pain reduction and functional improvement are clinically relevant, with lower recurrence rates compared with corticosteroids alone.
What Sets the Modern Approach Apart?
The medical acupuncturist combines dry needling at the inferior pole of the patella with low-frequency electroacupuncture (2 Hz) to enhance angiogenesis and the healing effect. The protocol also includes needling of trigger points in the quadriceps (especially the vastus lateralis and rectus femoris) which, when hypertonic, increase the tensile load on the patellar tendon.
Prescription of progressive eccentric exercises (25° decline to reduce initial load) is essential to mechanically organize the new collagen. The physician monitors load progression week by week, ensuring that the tendon is stimulated without being overloaded again.
When to See a Physician?
Pain at the lower part of the patella that worsens when descending stairs, squatting, or after intense jumping training should be evaluated. Differential diagnosis with patellofemoral syndrome, bursitis, and intra-articular loose bodies is essential before starting treatment.
Frequently Asked Questions
Acupuncture and dry needling are not curative on their own; they act as adjuvants that may stimulate the tendon's biological response. Combined with eccentric exercises and load adjustment, they can result in significant functional recovery in many cases, especially when symptom duration is less than 6 months. In chronic cases (more than 2 years), improvement is usually relevant, but the response tends to be more partial.
Absolute rest is not indicated and may delay healing. What is recommended is modification of training: maintenance of low-impact activities (cycling, swimming) and temporary substitution of jumping with progressive eccentric exercises. The physician will guide the appropriate volume and intensity for each phase.
Both stimulate tendon repair through biological mechanisms. PRP provides exogenously concentrated growth factors; dry needling activates the body's endogenous repair cascade. Dry needling is more accessible, can be repeated more frequently, and presents evidence comparable to PRP in studies of moderate quality.
Yes, but results take longer (12 to 16 sessions vs. 8 to 10 in recent cases). In chronic cases, the tendon has lower intrinsic regenerative capacity, and the protocol needs to be more intensive and more prolonged. The combination with extracorporeal shock waves can enhance results in very chronic cases.
Insertion is minimally painful. The "twitch response" upon reaching the point in the tendon may cause a brief and intense local contraction sensation, but it passes quickly. Many athletes report a transient sensation of "pressure" or "burning". Most tolerate the procedure well and report significant relief immediately.