Lisfranc's Injury Flashcards
What bones are considered part of the Lisfranc joint?
3 x Cuneiforms
Cuboid
Met bases 1-5
What provides stability to the Lisfranc joint?
Roman Arch
Keystone of the second met base
Ligaments
What ligaments are the strongest/largest?
Plantar ligaments
Describe the Lisfranc ligament
Oblique ligament that runs from plantar medial cuneiform to the base of the second metatarsal
Explain the common clinical findings
Pain w/ WB and loading of the FF
Edema
Bruising
Abnormal widening of the foot
Crushing type injury that displaces the mets plantarly
Direct Injury
Rotational force resulting in medial dislocation of the 1st met and dorsal lateral dislocation of the 2nd met
Indirect Injury
What must be evaluated with Lisfranc injuries
Angulation and translocation
Transverse and sagittal plane displacement
What is an important radiographic finding
Alignment of the second met base medially
Type A Hardcastle and Myerson
Total incongruity
- Lateral
- Dorsal/Plantar
Type B1 H and M
Partial Incongruity
- Medial dislocation of the 1st met
- Medial dislocation of the 1st met/cuneiform
Type B2 H and M
Partial incongruity
- Lateral dislocation mets 2-4
- Lateral dislocation of mets 2 and 3
Type C1 H and M
Divergent
-Partial displacement
Type C2 H and M
Divergent
-Total displacement
Radiographic diagnosis
Diastasis b/w the medial cuneiform
Diastasis b/w the 1st and 2nd mets
