The pain that appears when descending — and the cartilage that does not deserve the blame

Descending stairs, kneeling, sitting for long periods, and getting up from a chair: these activities share a common element — they increase the compression force between the patella and the fêmur. When pain arises in these movements, the most common diagnosis that arrives at the office is "patellar chondromalacia" — supposedly wear of the patellar cartilage. The problem is that this explanation does not hold up for most cases.

MRI studies show that most patients with só-called "chondromalacia" have completely normal patellar cartilage. What actually exists is patellofemoral syndrome — a muscular imbalance between the vastus medialis obliquus (VMO) and the vastus lateralis that alters patellar tracking, increasing pressure at specific points of the joint. This imbalance is treatable — and medical acupuncture is one of the most effective tools available.

The imbalance that misaligns the patella

  1. Weakened vastus medialis obliquus (VMO)

    The VMO is the only muscular structure that pulls the patella medially. When it weakens — due to disuse, injury, or pain inhibition —, the patella drifts laterally during knee extension.

  2. Tense vastus lateralis with trigger points

    The vastus lateralis, in addition to being in strength imbalance with the VMO, frequently develops trigger points that increase its passive tension and continuously pull the patella outward.

  3. Abnormal patellar tracking

    With the patella displaced laterally, contact between it and the lateral femoral condyle increases. This raises pressure on the lateral patellar cartilage and adjacent synovium, generating pain and local inflammation.

  4. Pain when descending stairs

    Descending stairs requires eccentric quadriceps contraction with load — the moment when patellofemoral compression force peaks. It is when the misaligned patella generates the most pain, explaining why descending is worse than ascending.

  5. Acupuncture as functional realignment

    Dry needling of the vastus lateralis deactivates trigger points and reduces lateral pull on the patella. Electroacupuncture on the VMO stimulates muscular activation of the medial belly. The result is functional realignment of patellar tracking.

Who suffers most with patellofemoral pain

25–40%
OF KNEE COMPLAINTS
in young adults and active women are patellofemoral syndrome — the most prevalent knee condition in this age group
2:1
WOMEN:MEN
The greater width of the Q-angle (angle between quadriceps and patellar tendon) in women predisposes to lateral patellar misalignment
80%
IMPROVEMENT
is the magnitude of clinical response frequently observed with combined protocol of medical acupuncture and specific VMO exercise in 8–12 weeks
5 years
AVERAGE DURATION
that patients treat "chondromalacia" with anti-inflammatories and rest without addressing the underlying muscular imbalance

How to identify patellofemoral syndrome

Critérios clínicos
08 itens

Patellofemoral syndrome — typical presentation

  1. 01

    Pain around or behind the patella — especially on the lateral or inferior face

  2. 02

    Intense worsening when descending stairs (worse than ascending)

  3. 03

    Pain when kneeling or getting up from a squatting position

  4. 04

    Pain after sitting for more than 30 minutes ("movie sign")

  5. 05

    Clicks or crepitus when bending the knee without associated pain

  6. 06

    Worsens after running, squatting, or cycling

  7. 07

    Relief with brief rest (distinguishes from osteoarthritis, which worsens after inactivity)

  8. 08

    Tense and painful vastus lateralis on palpation

Myths and facts about patellofemoral pain

Myth vs. Fact

MYTH

If it hurts, it is cartilage wear and there is no cure

FACT

Most cases of "chondromalacia" diagnosed clinically have intact cartilage on MRI. Pain is generated by muscular imbalance and trigger points in the vastus lateralis — fully treatable causes. Medical acupuncture with dry needling and VMO strengthening restore patellar tracking without any intervention on the cartilage.

MYTH

The treatment is to stop using the knee

FACT

Prolonged rest further weakens the VMO, which is already inhibited. The correct approach is to reduce high-compression activities (deep squat, excessive stair descent) while maintaining active strengthening of the VMO and dry needling of the vastus lateralis. Absolute rest perpetuates the weakness cycle.

MYTH

Surgery is the only resort when medications do not work

FACT

Surgery for patellofemoral syndrome has restricted indications and variable results. Consistently, conservative treatment — including dry needling, medical acupuncture, and supervised therapeutic exercise — tends to be the first line for most patients with PFS, with surgery reserved for refractory cases.

The Q-angle and patellar biomechanics

Neurofunctional treatment protocol

Biomechanical assessment
1st visit

Q-angle assessment. Clarke test (pain on patellar compression with quadriceps contracted). Palpation of the vastus lateralis searching for trigger points. Assessment of VMO strength (unilateral mini-squat). Analysis of patellar tracking in active extension.

Dry needling of the vastus lateralis
Sessions 1–4

Needling of trigger points in the vastus lateralis with twitch response. 4 Hz electroacupuncture at local points for 20 minutes. Application on the lateral patellar retinaculum when indicated. Immediate reduction of lateral pull on the patella.

VMO activation
Sessions 5–8

Low-frequency electroacupuncture at point ST-34 (above the superomedial border of the patella) for VMO stimulation. Prescription of specific isometric and isotonic exercises for the medial belly of the quadriceps. Guidance on permitted and avoided activities.

Functional return
Sessions 9–10

Progression to functional exercises: mini-squat, controlled step-down. Analysis of stair-descending technique. Assessment of patellar brace if necessary as temporary support.

Clinical pearl: the movie sign

Frequently asked questions

FREQUENTLY ASKED QUESTIONS · 03

Frequently Asked Questions

It depends on the intensity of the pain. Running on flat ground with mild pain (up to 3/10) is generally allowed. Steep descents, uneven terrain, and abrupt volume increases should be avoided. The physician evaluates progressive return to running and may indicate temporary modifications in technique and training volume.

Knee braces with patellar opening (O-shaped around the patella) can offer temporary symptomatic relief by guiding patellar tracking. They are an auxiliary resource, not a definitive treatment. Prolonged use without treating the underlying muscular imbalance perpetuates VMO weakness.

Most patients note significant reduction of pain when descending stairs between the 3rd and 5th session of dry needling on the vastus lateralis. Complete functional recovery — with normalized patellar tracking and strengthened VMO — takes 8–12 weeks in total, including the exercise program prescribed by the medical acupuncturist.