What is the appropriate evaluation and management for foot pain that occurs with weight-bearing in a patient with a prior foot fracture?

Foot Pain with Ambulation and Prior Fracture History

Start with plain radiographs of the foot as your initial imaging study—this is the appropriate first-line evaluation for foot pain with weight-bearing in a patient with prior fracture history 1.

Initial Evaluation Approach

Clinical Assessment

Focus your history on:

• Location and timing of pain relative to weight-bearing
• Character of prior fracture (which bone, healing complications, treatment received)
• Duration of current symptoms (chronic pain defined as >3 months post-normal healing time)
• Specific functional limitations during ambulation

Look for on examination:

• Point tenderness over specific bones (suggests stress fracture, malunion, or post-traumatic arthritis)
• Swelling patterns (localized vs diffuse)
• Gait abnormalities and weight-bearing tolerance
• Deformity suggesting malunion

Imaging Algorithm

Step 1: Plain Radiographs (Weight-Bearing)

• Order anteroposterior, lateral, and oblique views with weight-bearing 2
• Weight-bearing films are critical—they reveal functional instability and alignment issues not visible on non-weight-bearing films
• Radiographs detect:
  • Malunion or nonunion from prior fracture (sensitivity 88-96% for most foot fractures) 1
  • Post-traumatic arthritis
  • Stress fractures (though sensitivity is only 12-56%, specificity is 88-96%) 1
  • Hardware complications if prior surgical fixation

Step 2: Advanced Imaging (If Radiographs Negative or Equivocal)

• MRI is the next step when radiographs are non-diagnostic but clinical suspicion remains high
• MRI excels at detecting:
  • Occult stress fractures
  • Soft tissue pathology (plantar fascia, Achilles tendon)
  • Bone marrow edema
  • Early avascular necrosis
• CT is reserved for:
  • Detailed evaluation of complex malunions
  • Surgical planning for reconstructive procedures
  • Subtalar coalition assessment (though MRI also effective)

Step 3: Ultrasound (Selective Use)

• Consider only when high clinical suspicion for specific soft tissue pathology:
  • Plantar fasciitis (85% sensitivity, 95% specificity when combined with radiographic findings) 1
  • Achilles tendinopathy
  • Morton's neuroma
  • Plantar plate tears

Management Considerations Based on Prior Fracture

If Prior Metatarsal Fracture

• Malunion risk: Plantar flexion deformities are poorly tolerated and cause metatarsalgia 3
• If radiographs show malunion with plantar prominence, consider orthopedic referral for corrective osteotomy
• Axial plane deformities (varus/valgus) are generally better tolerated than coronal plane issues 3

If Prior Calcaneal Fracture

• Post-traumatic subtalar arthritis is common
• Look for loss of Böhler's angle on lateral radiographs
• Modern evidence supports earlier weight-bearing than traditional protocols suggest—complications are not increased with early mobilization 4, 5, 6
• If pain persists despite conservative management, subtalar arthrodesis may be needed

If Prior Fifth Metatarsal (Jones) Fracture

• High nonunion risk due to watershed blood supply at metaphyseal-diaphyseal junction
• Radiographs should specifically assess for:
  • Persistent fracture line
  • Sclerosis at fracture site
  • Lack of bridging callus
• Nonunion requires surgical fixation 7, 8

Common Pitfalls to Avoid

1. Ordering MRI first: This wastes resources and delays diagnosis of conditions readily visible on radiographs 1

2. Non-weight-bearing radiographs only: Weight-bearing views are essential to assess functional alignment and stability—this is particularly critical in evaluating prior fracture healing 2, 9

3. Assuming all prior fractures healed normally: Up to 51% of patients report persistent foot pain beyond 6 years, particularly women aged 70-75 1

4. Missing Lisfranc injuries: These are frequently overlooked—look for widening of the tarsometatarsal joint on weight-bearing films 2

5. Ignoring soft tissue causes: While prior fracture suggests bony etiology, plantar fasciitis and Achilles pathology are extremely common and may coexist

When to Refer to Orthopedics

• Radiographic evidence of malunion causing functional impairment
• Nonunion of prior fracture
• Progressive deformity or instability
• Failed conservative management after 3-6 months
• Hardware complications (loosening, prominence, infection)