What are the differential diagnoses for bilateral hip pain?

Differential Diagnosis for Bilateral Hip Pain

The differential diagnosis for bilateral hip pain is broad and must systematically exclude serious pathology first, then consider common bilateral conditions including osteoarthritis, inflammatory arthropathies, referred pain from the lumbar spine or pelvis, and bilateral soft tissue disorders.

Systematic Approach to Bilateral Hip Pain

Step 1: Exclude Red Flags First

Before considering common causes, you must rule out serious pathology that can present bilaterally 1:

• Infection (septic arthritis)
• Malignancy (primary bone tumors, metastatic disease)
• Fractures (stress fractures, insufficiency fractures)
• Perthes' disease (in children/adolescents)
• Slipped capital femoral epiphysis (SCFE) (in adolescents)
• Osteonecrosis of the femoral head

Step 2: Categorize by Pain Location

The evidence strongly supports organizing your differential by anatomic location 2, 3:

Anterior Hip/Groin Pain (Bilateral)

• Intra-articular causes:

  • Osteoarthritis (most common in older adults) 4
  • Inflammatory arthropathies (rheumatoid arthritis, ankylosing spondylitis, psoriatic arthritis)
  • Femoroacetabular impingement (FAI) syndrome 1
  • Labral tears 4
  • Crystal arthropathy (gout, pseudogout) 4
  • Synovitis (inflammatory, proliferative, or neoplastic) 4

• Extra-articular causes:

  • Hip flexor injuries/tendinopathy 2
  • Athletic pubalgia/sports hernia 5
  • Iliopsoas bursitis 4

Lateral Hip Pain (Bilateral)

• Greater trochanteric pain syndrome 2:
  • Gluteus medius/minimus tendinopathy or tears 4
  • Trochanteric bursitis 4
  • Iliotibial band friction 2

Posterior Hip Pain (Bilateral)

• Referred pain:
  • Lumbar spine pathology (radiculopathy, spinal stenosis) 4, 2
  • Sacroiliac joint dysfunction 3
• Local causes:
  • Piriformis syndrome/deep gluteal syndrome 2, 5
  • Hamstring tendinopathy 4
  • Ischiofemoral impingement 2

Step 3: Consider Systemic Conditions

Bilateral presentation specifically suggests:

• Inflammatory arthropathies (rheumatoid arthritis, seronegative spondyloarthropathies)
• Metabolic bone disease (osteomalacia, Paget's disease)
• Bilateral osteonecrosis (corticosteroid use, alcohol, sickle cell disease)
• Referred pain from abdomen/pelvis 4

Diagnostic Workup Algorithm

Initial Imaging

Obtain AP pelvis radiograph and bilateral frog-leg lateral views first 4, 1. This is the appropriate first test for bilateral hip pain and screens for:

• Osteoarthritis
• Dysplasia
• FAI morphology
• Fractures
• Tumors
• Osteonecrosis

Critical caveat: For osteoarthritis specifically, physical examination combined with radiography has reasonable sensitivity and specificity—often better than MRI 4.

Advanced Imaging (When Radiographs Are Negative/Equivocal)

MRI without contrast is the next appropriate test 4 for detecting:

• Occult fractures
• Osteonecrosis
• Bone marrow edema
• Soft tissue abnormalities (tendinopathy, bursitis, muscle injuries)
• Labral tears (though MR arthrography is superior for this) 4
• Tumors

Important limitation: Imaging should never be used in isolation—it must be combined with symptoms and clinical signs 1. Incidental findings are common and may not be the pain source.

Diagnostic Injections

Image-guided intra-articular hip injections with anesthetic are safe and useful for:

• Confirming intra-articular pain source 4
• Distinguishing from extra-articular causes 2
• Aspiration for crystal disease or infection 4

Key Clinical Pearls

The FADIR test (flexion-adduction-internal rotation) is the most appropriate clinical screening test for hip-related pain, despite limited quality evidence 1. A positive test suggests intra-articular pathology but has limited specificity.

Common pitfall: Bilateral presentation makes referred pain from the spine or pelvis more likely—always examine the lumbar spine and consider neurologic causes 4, 2.

Age matters:

• Younger adults: Consider FAI syndrome, labral tears, inflammatory arthropathies
• Older adults: Osteoarthritis is most common 4
• Adolescents: Must exclude SCFE and Perthes' disease 1

Bilateral osteonecrosis requires specific risk factor assessment (corticosteroid use, alcohol, sickle cell disease, trauma) and is best detected on MRI 4.