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"Isolated" traumatic radial-head dislocation

T L Lincoln1, S J Mubarak

  • 1Department of Orthopaedics, University of California at San Diego 92103.

Journal of Pediatric Orthopedics
|July 1, 1994
PubMed
Summary
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Delayed diagnosis of traumatic radial head dislocation often occurs without obvious ulnar fracture. This study reveals associated ulnar injury in all cases, introducing the "ulnar bow sign" for improved detection.

Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Trauma Care

Background:

  • Traumatic radial head dislocation, particularly without concurrent ulnar fracture, is frequently misdiagnosed or diagnosed late.
  • Existing literature often portrays this injury as an isolated radial head issue, overlooking potential ulnar involvement.
  • Accurate diagnosis is crucial for appropriate management and preventing long-term complications.

Purpose of the Study:

  • To challenge the notion of isolated radial head dislocation.
  • To investigate the frequency of ulnar injury in cases of traumatic radial head dislocation.
  • To introduce and validate a new radiographic sign for improved diagnosis.

Main Methods:

  • Retrospective review of all traumatic radial head dislocation cases over an 8-year period.

Related Experiment Videos

  • Radiographic analysis focusing on identifying associated ulnar injuries.
  • Description and proposed diagnostic criteria for the novel 'ulnar bow sign'.

    • Main Results:

    • An identifiable injury to the ulna was present in every case of traumatic radial head dislocation studied.
    • The 'ulnar bow sign' was identified as a reliable indicator of associated ulnar injury.
    • Deviation of the posterior border of the ulna > 0.01 mm from a straight line on lateral radiographs suggests injury.

    Conclusions:

    • Traumatic radial head dislocation is rarely an isolated injury and frequently involves the ulna.
    • The 'ulnar bow sign' is a valuable radiographic tool for detecting occult ulnar injury in these cases.
    • Increased awareness and utilization of the 'ulnar bow sign' can improve diagnostic accuracy and patient outcomes.