Distal Radius Fracture X-ray Signs: Wrist Alignment, Tilt, and DRUJ Clues
Distal radius fractures are the most common fractures in the upper extremity, typically resulting from a fall on an outstretched hand. They are classified by fracture pattern (Colles, Smith, Barton, chauffeur), articular involvement, and displacement. Radiographic measurements including radial height, radial inclination, and volar tilt guide treatment decisions. MRI can identify associated soft tissue injuries including TFCC tears and scapholunate ligament injuries.
Common Symptoms
- Immediate severe wrist pain and tenderness after a fall on an outstretched hand
- Visible dinner fork deformity with dorsal displacement in Colles-type fractures
- Rapid onset swelling and ecchymosis at the wrist and distal forearm
- Inability to grip, lift, or weight-bear through the affected hand
- Numbness or tingling in the thumb, index, and middle fingers from acute median nerve compression
- Tenderness directly over the distal radius metaphysis
Overview
Wrist X-ray is the first-line imaging test for most suspected distal radius fractures. Open PA, lateral, and oblique views in the free wrist X-ray viewer for private browser-based viewing, then compare associated ulnar-sided pain with TFCC tear or carpal widening with scapholunate injury.
Key Imaging Findings
- Fracture line through the distal radius metaphysis
- Articular surface involvement and step-off measurement
- Radial height, radial inclination, and volar tilt measurements
- Dorsal displacement and angulation (Colles pattern)
- Volar displacement (Smith fracture pattern)
- Associated ulnar styloid fracture and DRUJ stability assessment
Frequently Asked Questions
What radiographic measurements determine whether a distal radius fracture requires surgical fixation?
Accepted alignment thresholds include radial height of at least 10 mm (normal 11-12 mm), radial inclination of at least 15 degrees (normal 22-23 degrees), and volar tilt between negative 10 and positive 20 degrees (normal positive 11-12 degrees). Articular step-off or gap exceeding 2 mm at the radiocarpal or distal radioulnar joint is a strong indication for fixation. Radial shortening beyond 5 mm compared to the contralateral side predicts DRUJ instability and ulnar-sided symptoms.
What soft tissue injuries are associated with distal radius fractures and how does MRI help?
Concurrent soft tissue injuries occur in 50-70% of distal radius fractures detected arthroscopically. The most common are TFCC tears (Palmer 1D radial-sided tears from the sigmoid notch), scapholunate ligament tears, and lunotriquetral ligament injuries. Acute carpal tunnel syndrome from hematoma compressing the median nerve requires urgent decompression. MRI characterizes these associated injuries when post-reduction symptoms persist or before surgical planning.
Why is ulnar styloid fracture relevant in the setting of a distal radius fracture?
The ulnar styloid is the attachment point for the foveal component of the TFCC and the ulnocarpal ligaments. Base-of-styloid fractures that displace the foveal insertion destabilize the DRUJ and increase the risk of chronic DRUJ instability and ulnar-sided pain. Tip fractures rarely affect DRUJ stability. AI can help explain report terms about the ulnar styloid fracture, but a hand surgeon must assess joint stability and decide whether further stabilization or TFCC repair is needed.
Sources
- Lichtman DM, Bindra RR, Boyer MI, et al. Treatment of distal radius fractures. J Am Acad Orthop Surg. 2010;18(3):180-189.
- Knirk JL, Jupiter JB. Intra-articular fractures of the distal end of the radius in young adults. J Bone Joint Surg Am. 1986;68(5):647-659.
- Lindau T, Arner M, Hagberg L. Intraarticular lesions in distal fractures of the radius in young adults. A descriptive arthroscopic study in 50 patients. J Hand Surg Br. 1997;22(5):638-643.
- May MM, Lawton JN, Blazar PE. Ulnar styloid fractures associated with distal radius fractures: incidence and implications for distal radioulnar joint instability. J Hand Surg Am. 2002;27(6):965-971.
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