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The Talus
     ELHT Teaching Programme
            Hiren Divecha (ST4)
                      14/11/2011
Intro


Anatomy

Fractures & Management
1.   Neck (50%)
2.   Body (23%)
3.   Lateral & Posterior processes
4.   Head (5%)
5.   (OCD)
Anatomy


Latin for “ankle”
Also called astragalus
2nd largest tarsal bone
60% covered by articular cartilage
Retrograde blood supply
No muscular attachments

3 parts

Articulations:
 1.       Tibio-talar
 2.       Subtalar
 3.       Talo-navicular
Blood Supply
Blood Supply
Talar Neck Fractures


(Aviator’s astragalus)
Mechanism
   Forced dorsiflexion
   Axial load
   Supination
   RTA, fall from height
15-20% open
Assoc. malleloar # (25%)

Investigations
   AP, lateral, Canale view
   CT
Hawkin-Canale Classification
Type 1


Undisplaced (<1 mm)
50% missed on X-ray
Rx
  NWB BK cast 6/52
  WB in cast further 2-4
  weeks
Type 2


Displaced
  Subtalar disloc
Rx
  Immediate closed
  reduction
  ORIF
Type 3


Displaced
  Subtalar disloc
  Tibiotalar disloc
Body extruded
  Skin/ NV compression
>50% open
  38% deep infection rate
Rx
  Immediate ORIF
  Astragalectomy ?
Type 4


Displaced
  Subtalar disloc
  Tibiotalar disloc
  Talonavicular disloc
Risk of talar head AVN
Rx
  Immediate ORIF
  TNJ pinning
  Astragalectomy ?
ORIF - Approaches


1.   Anteromedial
     Medial to TA from navicular tub. (mall. osteotomy)
     Risk of damage deltoid vessels
     Difficult to assess rotation/ length
2. Anterolateral
     Lateral to EDL/PT
     Least vascular risk
3. Posterolateral
     Between FHL/ PL
ORIF - Fixation


Lag screws, titanium,
cannulated, graft
AP
  Medial + lateral
  Countersunk/ headless
PA
  Stronger construct
  (Swanson JBJS-A 1992)
  Risk of subtalar/ lateral
  penetration (talar neck
  axis!)
Risks


Type   AVN         OA        Malunion
I      0-13%       0-30%     0-10%
II     20-50%      40-90%    0-25%
III    69-100%     70-100%   18-27%
IV     90-100%     70-100%   >27%
Hawkins sign
Subchondral disuse
osteopenia in dome of talus
Revascularization and
atrophic change in the body
of the talus at 6-8 weeks
Good prognostic sign
  If absent at 12 weeks – 75% AVN
Talar body fracture


Intra-articular (ankle/ subtalar)
# line posterior to lateral
process (ie:post. facet)
Much poorer prognosis than
talar neck fractures
ORIF
   Medial approach with
   malleolar osteotomy
High risk of AVN, malunion &
OA
   Astragalectomy, arthrodesis
Lateral Process #


ATFL attachment
Snowboarder’s #
Mechanism
  Axial load, dorsiflexion, external rotation
Often misdiagnosed as lateral sprain
Rx
  Undisplaced – NWB BK cast 6-8 weeks
  Displaced (>2mm) – ORIF (>1cm), excision
Lateral Process #
Lateral Process #
Posterior Process #


Lateral – Shepherd’s #
(PTFL)
Medial – Cedell’s #
Can be mis-diagnosed as
ankle sprain
Pain on passive toe
movement (FHL)
Rx
  Undisplaced – NWB BK cast
  6-8 weeks
  Displaced – ORIF, excise
Talar Head #


< 10% of talar #s
Mechanism
  axial loading with the ankle in plantar flexion, against the
  distal tibia with ankle in dorsiflexion
Often TNJ dislocation
Rx
  Nondisplaced - NWB BK cast 8-12 weeks
  Displaced – excision (<50%), ORIF (>50%), TNJ arthrodesis
Complications
  OA, AVN(10%)
References


Fortin PT & Balazsy JE. Talus Fractures: Evaluation and
Treatment. J Am Acad Orthop Surg 2001;9:114-127
Hawkins LG. Fractures of the neck of the talus. J Bone Joint
Surg Am 1970;52: 991-1002
Canale ST, Kelly FB. Fractures of the neck of the talus:
Long-term evaluation of seventy-one cases. J Bone Joint
Surg Am 1978;60:143-156
Swanson TV et al. Fractures of the talar neck: A mechanical
study of fixation. J Bone Joint Surg Am 1992;74:544-551

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Talus anatomy, blood supply & fractures

  • 1. The Talus ELHT Teaching Programme Hiren Divecha (ST4) 14/11/2011
  • 2. Intro Anatomy Fractures & Management 1. Neck (50%) 2. Body (23%) 3. Lateral & Posterior processes 4. Head (5%) 5. (OCD)
  • 3. Anatomy Latin for “ankle” Also called astragalus 2nd largest tarsal bone 60% covered by articular cartilage Retrograde blood supply No muscular attachments 3 parts Articulations: 1. Tibio-talar 2. Subtalar 3. Talo-navicular
  • 6. Talar Neck Fractures (Aviator’s astragalus) Mechanism Forced dorsiflexion Axial load Supination RTA, fall from height 15-20% open Assoc. malleloar # (25%) Investigations AP, lateral, Canale view CT Hawkin-Canale Classification
  • 7. Type 1 Undisplaced (<1 mm) 50% missed on X-ray Rx NWB BK cast 6/52 WB in cast further 2-4 weeks
  • 8. Type 2 Displaced Subtalar disloc Rx Immediate closed reduction ORIF
  • 9. Type 3 Displaced Subtalar disloc Tibiotalar disloc Body extruded Skin/ NV compression >50% open 38% deep infection rate Rx Immediate ORIF Astragalectomy ?
  • 10. Type 4 Displaced Subtalar disloc Tibiotalar disloc Talonavicular disloc Risk of talar head AVN Rx Immediate ORIF TNJ pinning Astragalectomy ?
  • 11. ORIF - Approaches 1. Anteromedial Medial to TA from navicular tub. (mall. osteotomy) Risk of damage deltoid vessels Difficult to assess rotation/ length 2. Anterolateral Lateral to EDL/PT Least vascular risk 3. Posterolateral Between FHL/ PL
  • 12. ORIF - Fixation Lag screws, titanium, cannulated, graft AP Medial + lateral Countersunk/ headless PA Stronger construct (Swanson JBJS-A 1992) Risk of subtalar/ lateral penetration (talar neck axis!)
  • 13. Risks Type AVN OA Malunion I 0-13% 0-30% 0-10% II 20-50% 40-90% 0-25% III 69-100% 70-100% 18-27% IV 90-100% 70-100% >27%
  • 14. Hawkins sign Subchondral disuse osteopenia in dome of talus Revascularization and atrophic change in the body of the talus at 6-8 weeks Good prognostic sign If absent at 12 weeks – 75% AVN
  • 15. Talar body fracture Intra-articular (ankle/ subtalar) # line posterior to lateral process (ie:post. facet) Much poorer prognosis than talar neck fractures ORIF Medial approach with malleolar osteotomy High risk of AVN, malunion & OA Astragalectomy, arthrodesis
  • 16. Lateral Process # ATFL attachment Snowboarder’s # Mechanism Axial load, dorsiflexion, external rotation Often misdiagnosed as lateral sprain Rx Undisplaced – NWB BK cast 6-8 weeks Displaced (>2mm) – ORIF (>1cm), excision
  • 19. Posterior Process # Lateral – Shepherd’s # (PTFL) Medial – Cedell’s # Can be mis-diagnosed as ankle sprain Pain on passive toe movement (FHL) Rx Undisplaced – NWB BK cast 6-8 weeks Displaced – ORIF, excise
  • 20. Talar Head # < 10% of talar #s Mechanism axial loading with the ankle in plantar flexion, against the distal tibia with ankle in dorsiflexion Often TNJ dislocation Rx Nondisplaced - NWB BK cast 8-12 weeks Displaced – excision (<50%), ORIF (>50%), TNJ arthrodesis Complications OA, AVN(10%)
  • 21. References Fortin PT & Balazsy JE. Talus Fractures: Evaluation and Treatment. J Am Acad Orthop Surg 2001;9:114-127 Hawkins LG. Fractures of the neck of the talus. J Bone Joint Surg Am 1970;52: 991-1002 Canale ST, Kelly FB. Fractures of the neck of the talus: Long-term evaluation of seventy-one cases. J Bone Joint Surg Am 1978;60:143-156 Swanson TV et al. Fractures of the talar neck: A mechanical study of fixation. J Bone Joint Surg Am 1992;74:544-551