How should I evaluate and manage a patient with hip internal rotation pain?

Evaluation and Management of Hip Internal Rotation Pain

Use the FADIR test (flexion-adduction-internal rotation) as your primary clinical screening tool—a negative test helps rule out hip disease, while a positive test warrants further evaluation with imaging that must always be combined with clinical findings. 1

Initial Clinical Evaluation

Primary Screening Test

• Perform the FADIR test as the only validated clinical special test for hip-related pain in young and middle-aged active adults 1
• A negative FADIR test effectively helps rule out hip disease
• Note: Despite being only "cautiously recommended" due to low-quality supporting studies, this is the best available clinical screening tool 1

Critical Exclusions

Before proceeding with hip-specific diagnosis, you must exclude:

• Non-musculoskeletal conditions: tumors, infections, stress fractures, slipped capital femoral epiphysis (SCFE)
• Competing musculoskeletal sources: lumbar spine pathology, pelvic conditions 1

Other Clinical Tests - NOT Recommended

Do not rely on these tests for diagnosis, as they have insufficient diagnostic accuracy 1:

• Thomas test
• Prone instability test
• Ligamentum teres tear test
• Range of motion measurements alone
• Isolated muscle strength testing

Imaging Strategy

Initial Imaging (Required)

Order AP pelvis and lateral femoral head-neck radiographs (e.g., Dunn view, frog-leg/Lauenstein view, or cross-table view) 11

Advanced Imaging (When Indicated)

Order MRI/MRA or CT scan when:

• Three-dimensional morphological assessment is needed
• Evaluating intra-articular structures (labrum, cartilage, ligamentum teres) 1
• Non-surgical treatment has failed and surgery is being considered 1

Critical Imaging Caveat

Never diagnose based on imaging alone 1. Imaging has very limited ability to confirm a condition as the cause of pain, with only small to moderate post-test probability shifts. Labral, chondral, and ligamentum teres pathology are common incidental findings in asymptomatic people 11.

Diagnostic Classification

After combining clinical findings with imaging, categorize into one of three conditions 1:

1. FAI (Femoroacetabular Impingement) Syndrome

   • Cam or pincer morphology on radiographs
   • Positive FADIR test
   • Symptomatic presentation

2. Acetabular Dysplasia and/or Hip Instability

   • Abnormal center-edge angle or other dysplastic features
   • Clinical signs of instability

3. Other Conditions Without Distinct Bony Morphology

   • Isolated labral, chondral, or ligamentum teres pathology
   • May have normal bony morphology on imaging
   • Diagnosis requires correlation with symptoms and clinical signs

Management Approach

Conservative Treatment

• Monitor with patient-reported outcome measures (Copenhagen HAGOS or IHOT questionnaires) 2
• Include physical activity and sport-specific goals in treatment planning 2
• Address physical impairments: ROM, hip muscle strength, movement quality, functional tasks 2
• Use shared decision-making and set realistic expectations with patients 2

Surgical Consideration

Consider referral for surgical evaluation when:

• Physiotherapist-led treatment has failed
• Advanced imaging (MRI/MRA) may be necessary for surgical planning 1
• Patient has appropriate morphological findings correlating with symptoms

Key Pitfalls to Avoid

1. Do not diagnose from imaging alone—always integrate with symptoms and clinical signs 1
2. Do not over-interpret incidental imaging findings in asymptomatic structures 1
3. Do not rely on multiple special tests—only FADIR has sufficient evidence 1
4. Do not assume positive imaging equals causation—correlation with clinical presentation is essential 1