Patellofemoral Pain Syndrome

Lower Limb

Overview

Patellofemoral pain syndrome (PFPS) is a common anterior knee condition characterized by pain around or behind the patella, often aggravated by activities involving knee flexion such as climbing stairs, squatting, or prolonged sitting. It is typically a non-inflammatory condition resulting from altered patellar tracking and increased patellofemoral joint stress. PFPS accounts for 25-40% of all knee pain presentations in clinical practice.

Pathophysiology

PFPS results from abnormal patellar tracking within the femoral groove, causing increased pressure on articular cartilage and surrounding structures. Repetitive microtrauma to patellofemoral articular surfaces and periarticular tissues causes localized inflammation, pain sensitization, and proprioceptive deficits.

Typical Presentation

Site

Retropatellar or peripatellar region, particularly around medial facet or central patella; may be diffuse across anterior knee

Quality

Dull ache, pressure sensation, or sharp localized pain; often described as 'deep' or 'inside' the knee

Intensity

Mild to moderate (3-6/10), variable throughout day, often worse by end of day; rarely severe resting pain

Aggravating

Stairs (especially descending), squatting, prolonged sitting with knees bent (cinema sign), lunges, jumping, running on hard surfaces, kneeling, activities increasing knee flexion load

Relieving

Rest, leg elevation, ice application, knee extension, activity modification, sitting with leg extended

Associated

Anterior knee swelling (mild), sense of instability or 'giving way', quadriceps weakness, hip weakness, stiffness after inactivity, clicking or crepitus with movement, tight hip flexors and lateral knee structures

Orthopaedic Tests

Test descriptions are written with AI assistance from standard clinical texts. Where a test lists Sources, its description has been checked against them; those sources are independent and do not endorse OsteoKit. Accuracy figures and grades (A–D) appear only when checked against the published study; tests without one are marked “No accuracy study”.

Further reading: full test procedures are described in standard clinical examination texts, e.g. Magee & Manske, Orthopedic Physical Assessment (7th ed.), and Cook & Hegedus, Orthopedic Physical Examination Tests: An Evidence-Based Approach (2nd ed.).

Measurement

Quadriceps Angle (Q-angle)

Procedure

Patient supine, legs straight, quadriceps relaxed. Draw a line from the ASIS to the centre of the kneecap and a second line from the centre of the kneecap to the tibial tuberosity; measure the angle between them. Compare sides.

Positive Finding

A larger angle on one side, or a larger angle than expected.

Interpretation

Describes alignment, not diagnosis. The Q-angle varies with how it is measured and is similar in people with and without patellofemoral pain. Diagnosis rests on the history: pain around or behind the kneecap on squatting, stairs, running or sitting. The previously cited source was fabricated; the Q-angle has poor diagnostic value and is frequently present in asymptomatic individuals.

Further reading

No accuracy study

Single-Leg Squat Test

Procedure

Ask the patient to stand on one leg and squat slowly to about 45–60° of knee flexion and back up, five times, while you watch from the front.

Positive Finding

Reproduction of pain around or behind the kneecap, or the knee moving inwards, the pelvis dropping or the trunk leaning.

Interpretation

Reproduction of the familiar pain supports patellofemoral pain. Movement quality guides hip and knee rehabilitation. Poor control is also common in people without pain. A useful test of neuromuscular control, but no validated sensitivity/specificity for diagnosing patellofemoral pain syndrome.

Sources

No accuracy study

Step-Down Test

Procedure

Patient stands on a step on the affected leg and slowly lowers the other heel to touch the floor, five times, while you watch from the front.

Positive Finding

Reproduction of pain around the kneecap, or the knee moving inwards and the pelvis dropping.

Interpretation

Reproduction of pain supports patellofemoral pain and gives a measure to track. Movement quality guides rehabilitation. No validated diagnostic-accuracy data for patellofemoral pain syndrome.

Sources

Not a diagnostic test

Lateral Step-Up Test

Procedure

Patient stands side-on to a step, steps up with the affected leg, then lowers back down slowly.

Positive Finding

Reproduction of pain around the kneecap, or poor control of the knee or pelvis.

Interpretation

A functional loading test for monitoring and exercise planning, not a diagnostic test. No validated diagnostic-accuracy data for patellofemoral pain syndrome.

Further reading

Performance measure

Y-Balance Test (Lower Quarter)

Procedure

Patient stands on one leg on the centre of the test kit and reaches as far as possible with the other foot in three directions (anterior, posteromedial, posterolateral). Record the best reach in each direction and compare legs.

Positive Finding

Shorter reach on one side, or loss of balance.

Interpretation

A measure of dynamic balance and control, used for rehabilitation and return-to-sport decisions. It is not a diagnostic test for patellofemoral pain. The Y-Balance test predicts injury risk and measures dynamic balance; it is not a diagnostic test for patellofemoral pain syndrome.

Sources

No accuracy study

Patellar Tilt Test

Procedure

Patient supine, knee straight and relaxed. Try to lift the lateral border of the kneecap upwards, and compare with the other side.

Positive Finding

The lateral border cannot be lifted to horizontal, or less than on the other side.

Interpretation

Suggests a tight lateral retinaculum, a possible contributor to patellofemoral pain that can guide taping and soft-tissue treatment. Hip abductor strength, which this entry previously mixed in, should be tested separately.

Sources

⚠ Red Flags

  • •Acute severe trauma with significant swelling and inability to bear weight (rule out fracture, ligamentous injury)
  • •Knee locked in flexion or extension (meniscal pathology)
  • •Severe effusion with systemic symptoms (septic arthritis, inflammatory arthropathy)
  • •Unilateral calf swelling with calf pain and warmth (DVT)
  • •Signs of acute ACL or MCL rupture (acute instability, hemarthrosis)
  • •Swelling, warmth, and erythema suggesting infection or acute inflammatory process

⚡ Yellow Flags

  • •High pain catastrophizing or fear-avoidance beliefs related to knee pain
  • •Significant psychological distress or depression affecting rehabilitation engagement
  • •Excessive reliance on passive treatments without active participation
  • •Inconsistent reporting of pain severity versus functional limitation
  • •Social or occupational stressors limiting rehabilitation compliance
  • •Secondary gain factors or litigation involvement
  • •Poor sleep quality exacerbating pain perception

Osteopathic Techniques

Exercise therapy, especially hip- and knee-focused exercise together, is the core treatment, with combined treatments and foot orthoses as options. Knee, kneecap or lumbar mobilisation on its own is not recommended.

Region

Gluteal and hip rotator muscles

Technique

Soft tissue, lumbar and gluteal
Grade C
Limited evidence: indirect or low-quality support only
Consensus is uncertain about manual soft tissue techniques in patellofemoral pain. One small trial of an osteopathic package eased pain in runners.

Rationale

Eases tension in the hip and thigh muscles that help control knee alignment.

How it's done, cautions & evidence

How it's done

Hands-on soft-tissue work (kneading, stretching and sustained pressure) to the lumbar paraspinals, quadratus lumborum and gluteal muscles, usually prone or side-lying.

Cautions

Only minor side effects have been reported in trials.

Evidence in Patellofemoral Pain Syndrome

Collins 2018 consensus: uncertainty about manual soft tissue techniques in patellofemoral pain. Zago 2020 (n=82 runners): an osteopathic package (manipulation and myofascial release to the lumbar spine, hip, SIJ, knee and ankle) reduced pain compared with no treatment, as did exercise. Not tested alone.

Region

Lateral thigh: iliotibial band and vastus lateralis

Technique

Soft tissue, knee and quadriceps
Grade C
Limited evidence: indirect or low-quality support only
Consensus is uncertain about manual soft tissue techniques in patellofemoral pain. One small trial of an osteopathic package eased pain in runners.

Rationale

Hands-on work to the quadriceps and the tissues around the knee to ease tension and pain.

How it's done & evidence

How it's done

Hands-on kneading, stroking and sustained pressure to the quadriceps, the patellar and quadriceps tendons, the iliotibial band near the knee and the tissues around the joint. Transverse friction massage across a tendon is one form. In trials it was given alongside exercise.

Evidence in Patellofemoral Pain Syndrome

Collins 2018 consensus: uncertainty about manual soft tissue techniques in patellofemoral pain. Zago 2020 (n=82 runners): an osteopathic package (manipulation and myofascial release to the lumbar spine, hip, SIJ, knee and ankle) reduced pain compared with no treatment, as did exercise. Not tested alone.

Region

Patellofemoral joint (kneecap glides)

Technique

Articulation, knee (tibiofemoral and patellofemoral)
Contested
Evidence is conflicting across studies
Consensus advises against knee or kneecap mobilisation on its own. One small trial of a mixed osteopathic package was positive.

Rationale

Gentle, rhythmic glides of the knee and kneecap within their range to ease pain and stiffness.

How it's done, cautions & evidence

How it's done

Passive, low-velocity glides of the knee within its range, with no thrust: distraction and front-to-back glides of the tibia on the femur, and glides of the kneecap in each direction, usually 2–3 oscillations a second for 1–2 minutes. A Mulligan variant holds a sustained glide of the tibia while the patient actively bends and straightens the knee.

Cautions

In knee osteoarthritis trials, no serious adverse events were reported with manual therapy.

Evidence in Patellofemoral Pain Syndrome

Collins 2018 consensus: patellofemoral, knee or lumbar mobilisation in isolation is not recommended. Zago 2020 (n=82 runners): an osteopathic package that included knee techniques reduced pain compared with no treatment; mobilisation was not tested alone.

Region

Quadriceps (rectus femoris)

Technique

Muscle energy, hip and thigh musclesNo trials found

Rationale

Low-force, patient-powered stretch for tight hip and thigh muscles.

How it's done, cautions & evidence

How it's done

The muscle (for example the hamstrings, adductors or rectus femoris) is taken to its barrier. The patient pushes gently, at about 10–20% effort, against resistance for 5–10 seconds, relaxes for 3–5 seconds, and the new barrier is taken up.

Cautions

Not used with an acute fracture, a joint infection or a bone malignancy; take care with severe osteoporosis or after surgery that limits muscle contraction. Use the least force needed: too much can tear a muscle or pull off a tendon, especially in older patients.

Evidence in Patellofemoral Pain Syndrome

Searched 24 Oct 2026: no trials of quadriceps muscle energy technique in patellofemoral pain.

Region

Talonavicular and subtalar joints (midfoot)

Technique

Articulation, ankle and foot
Grade C
Limited evidence: indirect or low-quality support only
One small trial: talonavicular mobilisation eased pain more than foot strengthening right after treatment. Combining both did better for function at 4 weeks.

Rationale

Midfoot glides aimed at foot posture. One small trial eased pain; pair with foot strengthening and hip and knee exercise.

How it's done, cautions & evidence

How it's done

Passive, rhythmic, low-velocity glides of the ankle (talocrural), subtalar, midfoot and toe joints, within or up to the end of the available range, often aimed at restoring ankle dorsiflexion.

Cautions

Before mobilising an acute ankle injury, check for fracture with the Ottawa ankle rules (tenderness over either malleolus), and palpate the base of the 5th metatarsal, the navicular and the midfoot for a Lisfranc injury.

Evidence in Patellofemoral Pain Syndrome

Kim 2022 (RCT, n=48, three arms, 12 sessions): talonavicular joint mobilisation reduced pain more than foot core strengthening straight after treatment, and the blend of both improved function and knee valgus more than mobilisation alone at 4 weeks. Every arm had some foot treatment, so there is no comparison with no foot care.

Rehabilitation Exercises

Quadriceps and Hip Flexor Stretching

Range of MotionBeginner

Iliotibial Band and Lateral Knee Stretching (Modified Ober Position)

Range of MotionBeginner

Gastrocnemius and Soleus Calf Stretching

StretchingBeginner

Vastus Medialis Obliquus Strengthening (Terminal Knee Extension with Band)

StrengtheningBeginner

Gluteus Medius Strengthening (Side-Lying Hip Abduction)

StrengtheningBeginner

Gluteus Maximus Strengthening (Bridging with Single-Leg Progression)

StrengtheningIntermediate

Hip External Rotation Strengthening (Clamshells)

StrengtheningBeginner

Wall Squats with Attention to Knee Alignment

PosturalBeginner

Step-Up and Step-Down with Proper Femoral Alignment

PosturalIntermediate

Single-Leg Stance with Hip Stability Focus

BalanceIntermediate

Lateral Stepping with Resistance Band

BalanceIntermediate

Low-Impact Aerobic Activity (Swimming, Cycling with Proper Bike Fit, Elliptical)

CardiovascularBeginner

Referral Criteria

  • •Persistent pain unresponsive to conservative treatment over 6-8 weeks of structured rehabilitation
  • •Suspected structural damage (meniscal pathology, cartilage defect) indicated by locking, catching, or positive McMurray test
  • •Signs of patellofemoral osteoarthritis with imaging confirmation and progressive functional decline
  • •Suspected patellar instability or dislocation history requiring orthopedic surgical evaluation
  • •Concurrent knee ligamentous injury (ACL, MCL, PCL) with positive special tests and imaging confirmation
  • •Severe knee swelling, effusion, warmth, or systemic symptoms suggesting inflammatory or septic arthritis
  • •Significant functional limitation preventing ADLs or work duties unresponsive to conservative care
  • •Complex cases with multiple comorbidities or psychosocial factors limiting conservative management success