5th Metatarsal Fracture

Aetiology

  • Inversion injury

Pathophysiology

  • Avulsion by peroneus brevis tendon: heal predictably in moonboot, do well
  • Jones fracture: poor blood supply, 25% risk non-union
  • Proximal shaft: common site for stress fracture
notion image

Clinical presentation

  • Pain over lateral border of forefoot, especially with weight bearing

Investigations

  • Clinically resemble a lateral malleolar fracture - check this area on a lateral x-ray
  • 5th MT base fractures are transverse, so don't confuse with the normal longitudinal adolescent ossification centre

Management

  • Treatment can include protected weight bearing, immobilization or surgery depending on location of fracture, degree of displacement, and athletic level of patient