Evidence behind this recommendation.
Selected studies from our library that inform the recommendations on this page. Evidence grade shown when available.
Effect of laser acupuncture on pain, range of motion, and function in patellofemoral pain syndrome: a randomised controlled trial
“Patellofemoral pain syndrome is a condition that primarily affects adolescents and young adults, being twice as common in women as in men. This condition is characterized by pain in the anterior region of the knee, especially during cli...”
Acupuncture for Chronic Pain: Update of an Individual Patient Data Meta-Analysis
“Individual patient data meta-analysis confirms efficacy of acupuncture for chronic pain, with a sustained and clinically significant effect vs. sham and no-acupuncture controls.”
What Is Patellofemoral Pain?
Patellofemoral pain syndrome (PFPS) — also called "runner's knee" — is one of the most common causes of anterior knee pain in young people and active adults. It is characterized by pain around or behind the kneecap (patella) during or after activities that load the patellofemoral joint: squatting, running, going up and down stairs, and sitting for long periods with the knee flexed.
The central mechanism is patellar tracking dysfunction: the patella does not glide centrally in the trochlear groove during knee flexion/extension, generating excessive pressure on the lateral aspect of the patellofemoral joint. The force imbalance between the vastus lateralis (frequently hypertonic) and the vastus medialis obliquus — VMO (frequently weak and inhibited) — is the main culprit for this poor tracking.
Unlike chondromalacia patellae (which already involves cartilage injury), PFPS is functional — without structural injury — and highly responsive to conservative treatment that addresses the muscular imbalance.
Highly Prevalent
Affects 20%–40% of young athletes and is the leading cause of anterior knee pain in runners and cyclists.
VM/VL Imbalance
The hypertonic vastus lateralis and the weak VMO are frequently the protagonists — dry needling combined with VMO strengthening can help address this imbalance.
High Responsiveness
Because it is functional (without structural injury), PFPS responds exceptionally well to conservative treatment with acupuncture + physiotherapy.
Why Conventional Treatments Are Not Always Sufficient
Physiotherapy with VMO strengthening is the reference treatment for PFPS, but it presents a practical limitation: the VMO is reflexively inhibited by patellofemoral pain. The cycle is vicious — pain inhibits the VMO, which worsens poor tracking, which generates more pain, which further inhibits the VMO.
NSAIDs control pain temporarily without addressing the muscle imbalance. Patellar alignment knee braces offer external support, but do not correct the intrinsic cause. Acupuncture and dry needling of the vastus lateralis can contribute the "missing piece" of treatment: they reduce the hypertonia of the VL that inhibits the VMO, helping to modulate the cycle.
TREATMENTS FOR PATELLOFEMORAL PAIN SYNDROME
| TREATMENT | ADDRESSES IMBALANCE | SPEED OF RESPONSE |
|---|---|---|
| Rest + NSAIDs | No | Quick, but symptomatic |
| Physiotherapy (VMO alone) | Partial (without VL) | Slow (hypertonic VL perpetuates) |
| Patellar brace | No (external mechanical) | Immediate, does not resolve cause |
| VL needling + PT VMO | Yes (complete) | Quick (2-4 sessions) |
| Acupuncture + PT | Yes | Quick and lasting |
How Medical Acupuncture Works in Patellofemoral Pain
The mechanism is the same as described for chondromalacia patellae, with one important difference: in PFPS without cartilage injury, dry needling of the vastus lateralis is even more effective because there is no structural damage limiting recovery. Release of the hypertonic VL immediately reduces lateral traction on the patella, improving tracking and relieving pain.
Additionally, acupuncture in the L3-L4 segments reduces excessive activity of the motor neurons innervating the vastus lateralis, normalizing the activation balance between VL and VMO. This neuromodulatory effect on motor control is a unique advantage of acupuncture that physiotherapy alone cannot reproduce.
Mechanism of Action in Patellofemoral Syndrome
Dry needling of the vastus lateralis
Twitch response followed by deep relaxation of the VL reduces excessive lateral traction on the patella.
Improvement of patellar tracking
With the VL relaxed, the patella returns to a more medial trajectory in the trochlear groove, reducing lateral overload.
L3-L4 neuromodulation
Reduction of hyperactivity of the motor neurons that innervate the VL, normalizing the activation balance with the VMO.
Reduction of reflex inhibition of the VMO
With less patellofemoral pain, the joint inhibitory reflex that suppressed the VMO is reduced — the VMO can be activated again.
Effective VMO strengthening
With the VL relaxed and the VMO disinhibited, selective VMO strengthening exercises become much more effective.
What the Scientific Studies Say
PFPS is one of the conditions with the largest number of studies on dry needling and acupuncture. Results are consistently positive, with evidence of biomechanical improvement (patellar alignment) in addition to subjective pain reduction.
What Is Different About the Modern Approach
The medical acupuncturist evaluates the entire lower kinetic chain — hip, knee, and ankle — because PFPS frequently has proximal components (weakness of the hip abductors, which causes internal rotation of the femur and knee adduction) and distal components (excessive foot pronation, which also contributes to poor patellar tracking).
The complete protocol includes: dry needling of the VL (main), needling of the hip abductors if necessary, recommendation of corrective insoles for excessive pronation, and prescription of VMO exercises in closed kinetic chain (single-leg mini-squat with alignment control).
When to See a Physician
Pain in the front or around the kneecap when running, squatting, climbing stairs, or sitting for prolonged periods deserves medical evaluation. The differential diagnosis with chondromalacia patellae, infrapatellar bursitis, patellar tendinopathy, and Osgood-Schlatter syndrome is essential for the correct treatment.
Frequently Asked Questions
PFPS is functional — without structural cartilage injury. Chondromalacia patellae involves real cartilage degeneration on the posterior aspect of the patella. In practice, the two frequently coexist: untreated PFPS evolves to chondromalacia. Treatment is similar, but in PFPS without cartilage injury, results are generally faster and more complete.
In general yes, with modifications: reduction of volume and intensity, avoiding downhills and hard surfaces, using shoes with good absorption and, if indicated, a temporary patellar alignment brace. The physician will guide the training progression according to improvement. Running with mild pain (up to 3/10 on VAS) is generally acceptable; above that, training should be reduced.
When combined with VMO strengthening and addressing the risk factors (hip weakness, foot pronation), PFPS may show lasting remission in many patients. Without addressing the causal factors, there is a tendency for recurrence on returning to sport. The physician advises on maintenance of preventive exercises to reduce the risk of recurrences.
Needle insertion is practically painless. The "twitch response" — a quick involuntary contraction of the VL when the trigger point is reached — may surprise the patient, but lasts a fraction of a second and is followed by deep and pleasant relaxation. Most athletes describe the sensation as "the pressure I needed relieved."