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MSK Injury & Rehabilitation Hub
Hip & GroinImpingement / JointModerate evidence

Femoroacetabular Impingement Syndrome (FAIS)

Symptomatic nonarthritic hip condition involving motion-related hip/groin pain with clinical findings and cam/pincer morphology when imaging is relevant.

THE MSK CLINICAL STORY

A hip pinch, a deep squat and a misleading positive test

A fictional teaching case. Follow the clues, enjoy the conversation, and make the decisions a thoughtful clinician would make—not an instant diagnosis from a single symptom.

Scene 01 · The patient walks in

A young weightlifter says deep squats create a pinch in the groin. A video says one FADIR test can 'diagnose a cam.' The clinician quietly puts away the crystal ball.

A little clinic conversation

Lifter: 'FADIR hurt. So I definitely need surgery?' Therapist: 'One painful test doesn't get to write the whole ending.'

Scene 02 · Follow the clues

FAI syndrome involves symptoms, compatible examination and relevant imaging findings. Hip morphology alone can be present in people without symptoms.

Plot twist · What could fool us?

A positive FADIR reproduces pain but is not specific for FAIS. Consider hip OA, labral-related problems, lumbar referral and other causes as appropriate.

Choose your learning lens

Same clinical case, two ways to understand it. The complete examination and treatment guide is still available below.

In everyday words

Some hip positions may bring tissues into an uncomfortable range. We'll look at your symptoms, movement and imaging if needed, then build a plan for the activities you value.

Scene 03 · The rehabilitation journey

Adjust painful depth and training load → rebuild hip/trunk strength and movement options → graded return to squatting or sport.

See the full phased rehabilitation plan

You are the clinician · Interactive challenge

A lifter has groin pain and a positive FADIR test. What is required before diagnosing FAIS?

Choose one answer to reveal the explanation. No score, no pressure—just better clinical reasoning.

These cases teach reasoning; they do not provide a diagnosis for an individual patient. Always consider red flags, contraindications, comorbidities and local referral pathways.

PNA Clinical Visual Atlas

See this condition in 3D

Open the related anatomy and pathology visuals.

Open Visual Atlas

Structures Involved

  • Femoral head-neck junction
  • Acetabular rim
  • Labrum/cartilage may be involved
  • Hip and trunk muscles

Mechanism / Why It Happens

  • Repeated deep hip flexion/adduction/internal rotation exposure
  • Sport-specific pivoting/cutting
  • Morphology plus load and movement factors

Classification / Grades

  • Cam morphology
  • Pincer morphology
  • Mixed morphology

Symptoms

  • Groin/anterior hip pain
  • Pain with deep sitting/squatting
  • Pain with pivoting
  • Clicking may occur

Clinical Signs

  • Reduced hip internal rotation/flexion in some patients
  • Pain with FADIR
  • Movement-control deficits
  • Hip muscle weakness may coexist

Red Flags & Referral Clues

  • Fracture/stress fracture
  • Avascular necrosis risk
  • Septic joint/systemic illness
  • Severe night pain/unexplained weight loss
  • Neurologic symptoms not explained by hip

Diagnostic Examination

How to perform the tests — step by step

Each test includes patient setup, therapist position, hand placement, exact performance, positive finding and clinical interpretation.

FADIR

Provocative test for intra-articular/nonarthritic hip pain including FAIS.

Patient position

Supine.

Therapist position

Beside tested hip.

Hand placement

Support knee and ankle.

How to perform

  1. 1Flex hip toward about 90° or tolerated range.
  2. 2Adduct the hip.
  3. 3Add internal rotation.
  4. 4Ask if familiar groin pain is reproduced.

Positive sign

Concordant groin/anterior hip pain.

Interpretation

Sensitive provocative finding for intra-articular hip pathology; not specific enough to diagnose FAIS alone.

FABER / Patrick

Assess hip/SI-region symptom provocation and mobility.

Patient position

Supine; tested ankle placed above opposite knee in figure-four position.

Therapist position

Beside tested hip.

Hand placement

One hand stabilizes opposite pelvis/ASIS; the other gently lowers tested knee.

How to perform

  1. 1Place hip in flexion, abduction and external rotation.
  2. 2Stabilize opposite pelvis.
  3. 3Apply gentle downward pressure at knee if needed.
  4. 4Note pain location and range.

Positive sign

Groin pain suggests hip involvement; posterior pain may implicate SI-region structures.

Interpretation

Useful as part of differential assessment, not a standalone FAIS diagnosis.

Differential Diagnosis

  • Hip OA
  • Labral injury
  • Adductor-related groin pain
  • Iliopsoas-related pain
  • Lumbar referral
  • Stress fracture

Investigations / Imaging

  • Diagnosis combines symptoms, examination and imaging morphology when required.
  • Radiographs are commonly first-line imaging if FAIS is suspected; MRI may evaluate labrum/cartilage.

Complete Rehabilitation Plan

From protection to full function

Phase 1 — Modify Provocation & Restore Motion

Reduce repeated impingement-provoking load while maintaining activity.

What to do

  • Modify deep flexion/adduction/IR exposure
  • Hip and trunk mobility where truly restricted
  • Begin hip/trunk strengthening

Exercise dosage

  • Isometric/low-load hip abduction, extension, rotation: 3 x 8–15 or 3–5 holds
  • Movement retraining during squat/sit tasks

Progress when

  • Daily sitting/squat tolerance improving
  • Exercise tolerated without persistent flare

Phase 2 — Strength & Movement Coordination

Increase hip/trunk capacity and improve task mechanics.

What to do

  • Gluteus medius/maximus strengthening
  • Hip rotator/flexor strength
  • Trunk and lower-limb strengthening
  • Balance and movement-pattern training

Exercise dosage

  • Strength: 3–4 x 6–15, 2–4 days/week
  • Single-leg movement drills: 3 x 6–12

Progress when

  • Improved single-leg control
  • Stronger hip in required ranges
  • Reduced symptom provocation

Phase 3 — Sport / Deep-Flexion Exposure

Restore required range and loading tolerance.

What to do

  • Graded pivoting, running and deep-flexion exposure
  • Sport-specific acceleration/change of direction

Exercise dosage

  • 2–3 higher-level sessions/week with graded volume/intensity

Progress when

  • Required sport/work positions tolerated
  • Strength and confidence restored

Manual Therapy — Role & Application

  • Joint mobilization may be used when pain/capsular restriction limits mobility.
  • Soft-tissue techniques may be used when muscle/fascial restriction contributes to motion loss.
  • Avoid repeatedly forcing painful impingement range.

Modalities — Use / Avoid

  • Passive modalities are not first-line.
  • Use symptom-relieving options only if they help participation in active rehabilitation.

Return / Discharge Criteria

  • Functional hip ROM
  • Strong hip/trunk control
  • Pain-controlled deep flexion/pivoting as required
  • Sport-specific change of direction tolerated

Common Clinical Mistakes

  • Treating imaging morphology rather than symptoms/function
  • Aggressive stretching into painful impingement
  • Ignoring trunk/lower-limb movement strategy

Clinical Pearls

  • FADIR reproduces symptoms but does not by itself diagnose FAIS.
  • A multimodal program of activity modification, strengthening, movement training and selective manual therapy is supported.

Continue learning

Connect assessment with management

Use the related PNA learning pathways to explore examination techniques and structured rehabilitation. A test result should always be interpreted alongside the history, full examination and clinical presentation.

Evidence sources

Use these sources as a starting point for clinical learning. A reference being listed here does not, by itself, establish that every recommendation on this page is strongly supported. Check the original publication, study design, population and limitations before applying findings to an individual patient.

Educational resource only. Tests and treatment plans must be adapted to the individual patient, irritability, comorbidities, surgical restrictions and local scope-of-practice requirements.