Management Approach
Given the positive FADIR and FABER tests with normal imaging, this patient should undergo MR arthrography (MRA) to evaluate for intra-articular pathology, particularly labral tears, and be referred to a hip specialist while initiating physiotherapist-led rehabilitation focused on hip stabilization exercises. 1
Diagnostic Reassessment Required
The current workup is incomplete despite having standard MRI. The 2020 International Hip-related Pain Research Network consensus explicitly states that imaging should never be used in isolation but must be combined with symptoms and clinical signs 1. More critically:
- Standard MRI has limited diagnostic utility for labral, chondral, and ligamentum teres pathology, showing only "small to moderate shifts at best" in post-test probability 1
- MR arthrography (MRA) or CT arthrography is specifically recommended when evaluating intra-articular structures like the labrum 1
- The positive FADIR test (which you documented) has evidence supporting its use to screen for hip-related pain, though a negative test is more useful for ruling out disease 1
Key Clinical Context
This patient's presentation—positive FADIR/FABER, popping, occasional locking, and intermittent lower extremity numbness—strongly suggests intra-articular pathology despite the "normal" standard MRI. The numbness warrants particular attention as it may indicate:
- Nerve irritation from hip instability or labral pathology
- Concurrent lumbar spine involvement (though L-spine X-ray was normal, this doesn't exclude all pathology)
- Dynamic nerve compression during hip movements
Immediate Management Steps
1. Advanced Imaging
Order hip MR arthrography to properly evaluate:
- Labral tears (most likely given the clinical picture)
- Chondral lesions
- Ligamentum teres pathology
- Subtle FAI morphology that may not be apparent on plain radiographs
The guidelines emphasize that AP pelvis and lateral femoral head-neck radiographs should include specific views (Dunn, frog-leg, or cross-table) to assess three-dimensional morphology 1. Ensure your X-rays included these specialized views; if not, repeat them.
2. Initiate Physiotherapist-Led Rehabilitation
While awaiting MRA results and specialist evaluation, begin structured rehabilitation 2. The evidence supports physiotherapist-led treatment as first-line management for hip-related pain in young adults:
Exercise Program Focus:
- Hip joint centration exercises to address potential microinstability 3
- Deep hip stabilizer strengthening (gluteus medius, gluteus minimus, deep hip rotators)
- Motor control training
- Avoid aggravating positions (deep flexion with internal rotation)
Important caveat: The occasional locking and numbness suggest this may not respond to conservative treatment alone, but rehabilitation should still be initiated as it's indicated regardless of whether surgery becomes necessary.
3. Specialist Referral
Refer to an orthopedic surgeon specializing in hip preservation or sports medicine. The combination of:
- Mechanical symptoms (popping, locking)
- Positive impingement signs
- Young age (19 years)
- Neurologic symptoms
...suggests potential surgical candidacy if MRA confirms intra-articular pathology. Early referral is appropriate because labral tears and FAI syndrome typically have good surgical outcomes when addressed early 4.
Differential Diagnosis Framework
Based on the consensus guidelines, hip-related pain in young adults categorizes into 1:
- FAI syndrome (most common—affects ~50% of young adults with hip pain) 2
- Acetabular dysplasia/hip instability (consider given the numbness and popping)
- Other intra-articular conditions (labral, chondral, ligamentum teres pathology without specific bony morphology)
Your patient likely has either FAI syndrome with labral pathology or hip microinstability with secondary labral injury. The intermittent numbness raises concern for microinstability 3, which can present atypically and may coexist with other pathology.
Critical Pitfalls to Avoid
- Don't rely on standard MRI alone for ruling out labral pathology—it has insufficient sensitivity without intra-articular contrast 1
- Don't dismiss the numbness—this requires explanation and may indicate dynamic instability or nerve compression
- Don't delay specialist referral while pursuing prolonged conservative treatment given the mechanical symptoms
- Don't ignore the spine completely—the guidelines emphasize screening for lumbar and pelvic conditions that can mimic hip pain 1. Consider lumbar MRI if symptoms persist or worsen
- Recognize that "normal" imaging doesn't exclude pathology—incidental findings are common in asymptomatic people, but symptomatic patients with positive exam findings and normal imaging still require further investigation 1
Addressing the Lower Extremity Numbness
The numbness is concerning and not typical for isolated intra-articular hip pathology. Evaluate for:
- Deep gluteal syndrome with sciatic nerve entrapment 5
- Dynamic nerve compression from hip instability 3
- Lumbar radiculopathy (though less likely with normal L-spine X-ray, MRI may be needed)
- Ischiofemoral impingement (though typically causes posterior hip pain) 5
If numbness is reproducible with specific hip positions, this supports a hip-related etiology. If it follows a dermatomal pattern, lumbar MRI becomes necessary.
Treatment Algorithm Summary
- Order MR arthrography of the right hip
- Refer to hip preservation specialist (don't wait for MRA results given mechanical symptoms)
- Start physiotherapist-led rehabilitation focusing on hip stabilization
- Consider lumbar MRI if numbness persists or follows dermatomal pattern
- Avoid NSAIDs initially if considering diagnostic/therapeutic intra-articular injection
- Reassess in 6-8 weeks if conservative management pursued
The evidence strongly supports that diagnosis should never be made on imaging alone but requires integration of symptoms, clinical signs, and imaging findings 1. Your patient has the clinical picture; now obtain the appropriate imaging to complete the diagnostic workup.