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Table 3 Kaeding-Miller stress fracture classification system [1]

From: Taking a holistic approach to managing difficult stress fractures

Grade Pain Radiographic findings (CT, MRI, bone scan, or X-ray)
I Imaging evidence of stress FX
No fracture line
II + Imaging evidence of stress FX
No fracture line
III + Non-displaced fracture line
IV + Displaced fracture (>2 mm)
V + Non-union