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Bennett Fracture

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Other Names

  • 1st metacarpal fracture
  • Noncomminuted intra-articular fracture of the base of the proximal first metacarpal


  • Most common fracture involving base of thumb
  • Comminuted, two part intra-articular fracture of base of 1st metacarpal
    • Palmer radial fragment


Risk Factors

  • unknown

Differential Diagnosis

Clinical Features

  • General: Physical Examination Hand
  • Pain at base of thumb
  • Inspection: Swelling, bruising
  • Palpation: Tenderness at base of thumb


  • Standard Radiographs Hand
    • Robert's View: True AP of thumb
    • Intra-articular, 2 piece fracture of the base of the 1st metacarpal
    • Dorsolaterally displaced
  • Ultrasound
    • 5% sensitivity and 98.3% specificity[1]
    • Water bath technique can help
  • CT
    • Useful to clarify complex fracture patterns


  • Gedda Classification:[2]
    • Type 1: single ulnar fragment and subluxation of the metacarpal base
    • Type 2: an impaction fracture without subluxation of the first metacarpal
    • Type 3 an injury with a small ulnar avulsion fragment in association with metacarpal dislocation



  • Can be considered in stable, non-displaced fractures
  • Thumb spica cast


  • Most are considered unstable and require surgical intervention
    • Unstable fracture patterns
    • Intra-articular displacement of >1 mm

Return to Play

  • Needs to be updated


See Also



  1. Blaivas, Michael, et al. “Water bath evaluation technique for emergency ultrasound of painful superficial structures.” The American journal of emergency medicine 22.7 (2004): 589-593.
  2. GEDDA KO. Studies on Bennett's fracture; anatomy, roentgenology, and therapy. Acta Chir Scand Suppl. 1954;193:1-114
Created by:
John Kiel on 15 August 2019 23:01:58
Last edited:
26 September 2023 16:33:28
Trauma | Osteology | Finger | Hand | Wrist | Fractures