MRI as a reference standard for suspected scaphoid fractures.

Area of Science:

• Radiology
• Orthopedic Surgery
• Medical Imaging

Background:

• Scaphoid fractures are common wrist injuries.
• Magnetic Resonance Imaging (MRI) is increasingly used for diagnosis.
• The accuracy of MRI as a reference standard for scaphoid fractures is debated.

Purpose of the Study:

• To determine the rate of false-positive diagnoses of acute scaphoid fractures in healthy volunteers using MRI.
• To assess the specificity of MRI for detecting scaphoid fractures.

Main Methods:

• A prospective study involving 33 healthy volunteers with 64 wrist MRI scans.
• MRI scans of healthy volunteers were anonymized and mixed with scans of patients with suspected fractures.
• Five radiologists independently interpreted the blinded MRI scans for scaphoid fractures.

Main Results:

• MRI demonstrated a specificity of 96% for scaphoid fracture diagnosis in healthy volunteers.
• A total of 13 false-positive diagnoses of scaphoid fractures were made among healthy volunteers.
• Interobserver agreement among radiologists was moderate (multirater kappa = 0.44).

Conclusions:

• While MRI has high specificity for scaphoid fractures, false-positive diagnoses occur.
• Radiologists exhibit only moderate agreement when interpreting MRI scans of healthy volunteers.
• MRI is not considered an adequate reference standard for diagnosing true scaphoid fractures.