In a distal radius fracture with dorsal comminution, the radiographic criterion that most strongly indicates the need for surgical fixation is:

• A Radial shortening >2 mm
• B Radial styloid height <8 mm after closed reduction, combined with dorsal angulation >10° and radial shortening >5 mm ✓
• C Loss of volar tilt beyond 0° (dorsal tilt)
• D Dorsal comminution alone without displacement

Explanation

Acceptable reduction criteria for distal radius fractures (Fernandez/AO criteria) include: radial shortening <3 mm, dorsal tilt <10°, radial inclination >15°, and intra-articular step-off <2 mm. The combination of radial shortening >5 mm, dorsal angulation >10°, and radial styloid height <8 mm after attempted closed reduction indicates inherent instability and need for surgical fixation (typically volar locking plate). Any single parameter alone (e.g., mild shortening) may be managed conservatively; it is the combination of multiple failed criteria that mandates surgery.

Reference: Maheshwari Essential Orthopaedics, 6th ed.

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Written and medically reviewed by the StethoPrep medical team.