Radiology of the Foot
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Transcript of Radiology of the Foot
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Radiology of the Foot
Mark WahbaX-Ray rounds
July 24th, 2003
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Goals
• Approach to radiography of the foot• Become familiar with a Lisfranc injury• Become familiar with a Jones fracture
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Outline
• Bones• Views• Important Points• Lisfranc Joint• Jones fracture• Films
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The foot
• 28 bones• 57 articulations
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3 anatomic and functional regions
• Hindfoot: talus, calcaneus• Midfoot: navicular, cuboid, cuneiforms• Forefoot: metatarsals, phalanges, sesamoids
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Bones
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Bones
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Accessory Ossification Centres
• Normal• 30% of population• Smooth corticated surfaces
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Adequate views
• Anterior-Posterior• Oblique• Lateral
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AP
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AP view
• Medial margin of the base of the 2nd metatarsal is in line with the medial margin of the middle cuneiform
• Base of the 3rd metatarsal is obscured• View 1st and 2nd MT, medial and middle
cuneiform
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AP alignment
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Oblique
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Oblique view
• Medial margin of the base of the 3rd metatarsal should be in line with the medial margin of the lateral cuneiform
• Base of the 2nd metatarsal is obscured• View 3,4,5 MT, lateral cunieform,
navicular, cuboid
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Oblique alignment
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Lateral
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Lateral
• Hindfoot• Soft tissues• View articulations: CalCub, TN, NCun
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Bohler’s Angle
• Draw a line from the posterior aspect of the calcaneum to its highest midpoint
• Draw a line from the anterior aspect of the calcaneum to its highest midpoint
• Measured angle is from 20-40 degrees
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Bohler’s Angle
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Jacques Lisfranc
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Lisfranc Joint
• named for Jacques Lisfranc (1790-1847), a field surgeon in Napoleon's army
• “described an amputation performed through this joint because of gangrene that developed after an injury incurred when a soldier fell off a horse with his foot caught in the stirrup”
• refers to the articulation involving the first and second metatarsals with the medial and middle cuneiforms
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• Any injury to this area, whether dislocation or fracture-dislocation, is termed a Lisfranc injury
• Initially missed 20% of the time• high risk of chronic pain and functional
disability if they go unrecognized
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Presentation
• Hx of Direct trauma• Hx of Indirect trauma: “force is transmitted
to the stationary foot so that the weight of the body becomes a deforming force by torque, rotation or compression”
• Pain in midfoot• Inability to weight bear, especially on toes• Lisfranc Injury of the Foot: A Commonly Missed Diagnosis, BURROUGHS et al., American Family
Physician, July 1998, 58 no. 1 ,p.118
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Why?
• “While transverse ligaments connect the bases of the lateral four metatarsals, no ligament exists between the first and second metatarsal bases. The joint capsule and dorsal ligaments form the only minimal support about the Lisfranc joint, creating a "weak link" that is prone to injury.”
• http://emedhome.com/case-archivedata.cfm?ID=case120701
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• Almost invariably involve metatarsal fractures
• Usually the 2nd metatarsal• # cuboid, cuneiform, navicular occur in
39%• Weight bearing views are useful
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Signs of a Lisfranc injury• The medial shaft of the 2nd metatarsal should be aligned with the
medial aspect of the middle cuneiform on the AP view. • The medial shaft of the 3rd metatarsal should be aligned with the
medial aspect of the lateral cuneiform on the oblique view. • The first metatarsal cuneiform articulation should have no
incongruency. • The presence of small avulsed fragments ("fleck sign")should be
sought in the medial cuneiform-second metatarsal space.• The naviculocuneiform articulation should be evaluated for
subluxation. • Should be no "step-off" as each metatarsal shaft should never be more
dorsal than its respective tarsal bone• http://emedhome.com/case-archivedata.cfm?ID=case120701
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AP
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AP
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Oblique view
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Oblique view
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lateral
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lateral
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Jones Fracture
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Jones Fracture
• “Sir Robert Jones described his own fracture of the fifth metatarsal in 1902, when he injured himself while dancing around a Maypole at a military garden party”
• # at base of 5th metatarsal at metaphyseal-diaphyseal junction
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• w/in 1.5 cm distal to tuberosity of 5th metatarsal
• Should not be confused w/ more common avulsion # of 5th metatarsal tuberosity
• An oblique radiograph is essential to accurately assess this fracture
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• trauma site corresponds to the area between the insertion of the peroneus brevis and tertius tendons
• peroneus tertius originates on anterior aspect of fibula
• injury occurs when the ankle is plantar flexed and a strong adduction force is applied to the forefoot
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Jones fracture
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• Ortho follow up• NWB cast 6-8 weeks• Notorious for nonunion and needing ORIF
b/c of low vascularization and high stresses at this site
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5th metatarsal avulsion #
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• aka Dancer’s Fracture• Conservative
treatment 4-6 wks• Cast, brace, crutches,
wooden soled shoe
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• Thought to occur due to stress on the plantar aponeurosis causing an avulsion
• Fractures of the Fifth Metatarsal Yu W. D. et al, THE PHYSICIAN AND SPORTSMEDICINE - VOL 26 - NO. 2 - FEBRUARY 98
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Apophysis of 5th metatarsal
• “bony outgrowth that has never been entirely separated from the bone of which it forms a part”
• Found in the skeletally immature
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Stress fracture
• a stress phenomenon at the metaphyseal-diaphyseal junction
• “severe intramedullary sclerosis, profound thickening of both the medial and lateral cortices, lucency in the lateral cortex”
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• Treat conservatively or operatively depending on activity level
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Films
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Lisfranc fracture/dislocation
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Calcaneal fractures
• Most commonly fractured tarsal bone• 25% have other lower extremity injury• thoracolumbar fractures occur in 10% of
patients with calcaneal fractures
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1st metatarsal #
• Lisfranc injury
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Subtalar Dislocation
• Disruption of talocalcaneal and talonavicular joints
• No disruption of the tibiotalar joint• Closed reduction, ortho consult
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Fracture Talus
• 2nd most common tarsal fracture• Mechanism: plantar or dorsi flexion plus
inversion• High incidence of complications: AVN
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Talus fractures
• talar neck • excessive dorsiflexion of the ankle• stepping on brakes in MVA, snowboarders • AVN, subchondral collapse, degenerative
arthritis• Need ortho consult in ED
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Fracture of Navicular and Cuboid
• Navicular # high risk of AVN (similar to scaphoid)
• Most can have ortho F/U but if intra-articular should be seen in ED
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Lisfranc dislocation
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Jones fracture
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Lisfranc fracture/dislocation
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Fracture calcaneus
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Lisfranc injury
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Summary
• Know what to look at on each view• Know what to look for in Lisfranc Injuries• Know what to look for in a Jones fracture
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References• Accident & Emergency Radiology A Survival Guide, Raby et al, 2001 Harcourt Publishers ltd
Toronto Chapter 13• Pitfalls in Radiographic Interpretation, Part 2, Michelle Lin, MD,
http://emedhome.com/archives-data.cfm?ID=news042803&Type=news• Clinical Cases, Emedhom.com, http://emedhome.com/case-archivedata.cfm?ID=case120701• Lisfranc Injury of the Foot: A Commonly Missed Diagnosis, BURROUGHS et al., American Family
Physician, July 1998, 58 no. 1 ,p.118• Rosen’s Emergency Medicine Concepts and Clinical Practice 5th ed., Marx et al. Mosby, Toronto,
2002 chapter 51• Wheeless' Textbook of Orthopaedics, http://www.ortho-u.net/Welcome.html• Fractures of the Proximal Fifth Metatarsal, STRAYER et al. American Family Physician, May 1999,
59 no.9 p.2516• Lisfranc Fracture Dislocation, Early J. S. http://www.emedicine.com/orthoped/topic511.htm• Fractures of the Fifth Metatarsal Yu W. D. et al, THE PHYSICIAN AND SPORTSMEDICINE -
VOL 26 - NO. 2 - FEBRUARY 98 • Pitfalls in the Radiologic Evaluation of Extremity Trauma:Part II. The Lower Extremity,
SHEARMAN C. S. et al, American Family Physician March 1998