Szyszkowitz et al developed a classification scheme for fractures of the talus. The type of fracture correlates with complications. The authors are from Universitatsklinik fur Unfallchirurgie in Graz, Austria.
Parameters:
(1) location of the tumor
(2) displacement and/or dislocation
Location of the Fracture
Displacement or Dislocation
Type of Fracture
peripheral
fragments are not markedly displaced; may be rotated or tilted
Type I
central
none
Type II
central
displacement
Type III
central
dislocation
Type IV
where:
• Central fractures involve the proximal neck or body.
• Peripheral fractures involve the lateral process, posterior process, distal neck or head.
• In Type IV fractures the body may be displaced dorsally, medially between the tibia and the Achilles tendon, or infrequently laterally. It may also be rotated.
Type of Fracture
Complications
Type I
circulation intact, with no avascular necrosis
Type II
circulation mostly intact, with avascular necrosis uncommon
Type III
intraosseous circulation is interrupted, with avascular necrosis common
Type IV
most of the blood supply is damaged, resulting in extensive necrosis of the body
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