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Updated: 12/3/2021

Talus Fracture (other than neck)

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Images - AP - Non displaced Lateral Process f_moved.jpg - Lat - Non displaced Lateral Process f_moved.jpg - Non displaced Lateral Process fx_moved.jpg Scan - Non displaced Lateral Process fx_moved.jpg
  • Summary
    • Talus fractures (other than neck) are rare fractures of the talus that comprise of talar body fractures, lateral process fractures, posterior process fractures, and talar head fractures.
    • Diagnosis is made radiographically with foot radiographs but CT scan is often needed for full characterization of the fracture.
    • Treatment is generally nonoperative with immobilization for minimally displaced injuries and surgical reduction and fixation for displaced and intra-articular fractures. 
  • Epidemiology
    • Incidence
      • rare
        • less than 1% of all fractures
        • second most common tarsal fractures after calcaneus fxs
    • Anatomic location
      • talar body fractures
        • account for 13-23% of talus fractures
      • lateral process fractures
        • account for 10.4% of talus fractures
      • talar head fracture
        • least common talus fracture
  • Etiology
    • Mechanism
      • talar body
        • injuries often result from high energy trauma, with the hindfoot either in supination or pronation
      • lateral process of talus
        • injuries result from forced dorsiflexion, axial loading, and inversion with external rotation
          • often seen in snowboarders
  • Anatomy
    • 3D Anatomy of talus
    • Talus has no muscular or tendinous attachments
    • Articulation
      • there are 5 articulating surfaces
        • seventy percent of the talus is covered by cartilage
        • inferior surface articulates with posterior facet of calcaneus
      • talar head articulates with
        • navicular bone
        • sustenaculum tali
      • lateral process articulates with
        • posterior facet of calcaneus
        • lateral malleolus of fibula
          • this forms the lateral margin of the talofibular joint
      • posterior process consist of medial and lateral tubercle separated by groove for FHL
    • Blood supply
      • because of limited soft tissue attachments, the talus has a direct extra-osseous blood supply
      • sources include
        • posterior tibial artery
          • via artery of tarsal canal (most important and main supply)
            • supplies most of talar body
          • via calcaneal braches
            • supplies posterior talus
        • anterior tibial artery
          • supplies head and neck
        • perforating peroneal arteries via artery of tarsal sinus
          • supplies head and neck
        • deltoid artery (located in deep segment of deltoid ligament)
          • supplies body
          • may be only remaining blood supply with a talar neck fracture
  • Classification
    • Anatomic classification
      • Anatomic classification
      • Lateral process fracture
      •  Type 1
      • Fractures do not involved the articular surface
      •  Type 2
      • Fractures involve the subtalar and talofibular joint
      •  Type 3
      • Fractures have comminution
      • Posterior process
      •  Posteromedial tubercle
      • Avulsion of the posterior talotibial ligament or posterior deltoid ligament
      •  Posterolateral tubercle
      • Avulsion of the posterior talofibular ligament
      • Talar head fracture
      • Talar body fracture
  • Physical Exam
    • Symptoms
      • pain
        • lateral process fractures often misdiagnosed as ankle sprains
    • Physical exam
      • provocative tests
        • pain aggravated by FHL flexion or extension may be found with a posterolateral tubercle fractures
  • Imaging
    • Radiographs
      • recommended views
        • AP and lateral
          • lateral process fractures may be viewed on AP radiographs
        • Canale View
          • optimal view of talar neck
          • technique
            • maximum equinus
            • 15 degrees pronated
            • Xray 75 degrees cephalad from horizontal
        • careful not to mistake os trigonum (present in up to 50%) for fracture
        • may be falsely negative in talar lateral process fx
    • CT scan
      • indicated when suspicion is high and radiographs are negative
        • best study for posterior process fx, lateral process fx, and posteromedial process fx
      • helpful to determine degree of displacement, comminution, and articular congruity
    • MRI
      • can be used to confirm diagnosis when radiographs are negative
  • Treatment
    • Nonoperative
      • SLC for 6 weeks
        • indications
          • nondisplaced (< 2mm) lateral process fractures
          • nondisplaced (< 2mm) posterior process fractures
          • nondisplaced (< 2mm) talar head fractures
          • nondisplaced (< 2mm) talar body fractures
        • technique
          • cast molded to support longitudinal arch
    • Operative
      • ORIF/Kirshner wire Fixation
        • indications
          • displaced (> 2mm) lateral process fractures
          • displaced (> 2mm) talar head fractures
          • displaced (> 2mm) talar body fractures
            • medial, lateral or posterior malleolar osteotomies may be necessary
          • displaced (> 2mm) posteromedial process fractures
            • may require osteotomies of posterior or medial malleoli to adequately reduce the fragments
      • fragment excision
        • indications
          • comminuted lateral process fractures
          • comminuted posterior process fractures
          • nonunions of posterior process fractures
  • Technique
    • ORIF/Kirshner Wires
      • approaches
        • lateral approach
          • for lateral process fractures
          • incision over tarsal sinus, reflect EDB distally
        • posteromedial approach
          • for medial tubercle of posterior process fracture or for entire posterior process fracture that has displaced medially
          • between FDL and neurovascular bundle
        • posterolateral approach
          • for lateral tubercle of posterior process fractures
          • between peroneal tendons and Achilles tendon (protect sural nerve)
          • beware when dissecting medial to FHL tendon (neurovascular bundle lies there)
        • combined lateral and medial approach
          • required for talar body fractures with more than 2 mm of displacement
    • Fragment excisions
      • incompetence of the lateral talocalcaneal ligament is expected with excision of a 1 cm fragment
        • this is biomechanically tolerated and does not lead to ankle or subtalar joint instability
  • Complications
    • AVN
      • Hawkins sign (lucency) indicates revascularization
        • lack of Hawkins sign with sclerosis is indicative of AVN
    • Talonavicular arthritis
      • posttraumatic arthritis is common in all of these fractures
      • this can be treated with an arthrodesis of the talonavicular joint
    • Malunion
    • Chronic pain from symptomatic nonunion
      • may have pain up to 2 years after treatment
    • Subtalar arthritis
      • found in 45% of patients with lateral process fractures, treated either non-operatively or operatively
        • anatomic reduction of the articular surface can decrease incidence
  • Prognosis
    • Lateral process injuries have a favorable outcomes with prompt diagnosis and immediate treatment
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Questions (5)
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(SBQ20FA.3) Figure A is the radiograph of a 24-year-old male who presents to the ED with complaints of right ankle pain after sustaining an injury while snowboarding. He is diagnosed with an ankle sprain. He presents to your office two weeks later for evaluation due to continued pain and difficulty with ambulation. A CT of the ankle is obtained and depicted in Figure B. Which of the following is the true regrading this injury?

QID: 215732

Articulates with the medial facet of calcaneus



Excision of a 5mm fragment results in incompetence of the lateral talocalcaneal ligament



Has medial and lateral tubercles that are separated by a groove for the FHL



Most common complication irrespective of treatment is subtalar arthritis



Short leg cast immobilization is recommended for a 4 mm displaced fragment



L 5 E

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(OBQ10.154) Excision of the 1 centimeter talar fragment shown in Figure A would lead to complete incompetence of which of the following structures?

QID: 3242

Bifurcate ligament



Inferior peroneal retinaculum



Lateral talocalcaneal ligament



Arcuate ligament



Posterior talofibular ligament



L 1 C

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(OBQ04.123) A 34-year-old male has persistent anterolateral ankle pain after a snowboarding injury 1 week ago and is unable to bear weight. Three good quality radiographic views of the ankle are negative for fracture or other abnormalities. What is the next best step in management?

QID: 1228

Short leg cast application



Bone scan



MRI of ankle



Diagnostic injection



Repeat radiographs



L 3 D

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Evidence (18)
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