[Coalition 17] Harris Heel View: Radiographic Key to Talocalcaneal Coalition

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The Harris heel (axial) view is a specialized radiograph designed to evaluate the subtalar joint, particularly for detecting talocalcaneal coalitions.

Normal Harris view

• Structures: calcaneal body, middle facet, posterior facet (anterior facet obscured by talar head).
  
  
• Sustentaculum tali projects clearly from the medial calcaneus.
  
  
• Key feature: parallel orientation of middle and posterior subtalar facets (<20°).
  
  

Abnormal Harris view (coalition)

• Non-osseous (fibrous/cartilaginous):
  
  
• Osseous (synostosis):
  
  

Radiology perspective

• A normal Harris view reassures with parallel middle and posterior facets.
  
  
• Any loss of parallelism, irregular cleft, or bony bridge strongly suggests coalition.
  
  
• Still valuable as a screening tool, though CT and MRI remain gold standards for full characterization.
  
  

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