Hardcastle Myerson Classification

Hardcastle Myerson Classification is a special type of classification for identifying the severity of the metatarsal bone injury, and Lisfranc injuries are known to be rare and often overlooked injuries that can cause long-term disability and pain when missed or treated incorrectly. The wide variety of Lisfranc injuries ranges from subtle ligament distensions to open fracture-dislocation

Hardcastle & Myerson Classification

Ligaments injury of the plantar ligament between the medial cuneiform and the second and third metatarsals along with the Lisfranc ligament is necessary to give transverse instability intermetatarsal ligaments between second-fifth metatarsal bases no direct ligamentous attachment between first and second metatarsal, Lisfranc ligament, an interosseous ligament that goes from medial cuneiform to base of 2nd metatarsal on the plantar surface, critical to stabilizing the 1st and 2nd tarsometatarsal joints and maintenance of the midfoot arch, Lisfranc ligament tightens with pronation and abduction of forefoot, plantar tarsometatarsal ligamentsdorsal tarsometatarsal ligaments, dorsal ligaments are weaker and therefore bony displacement with injury is often dorsal. 
Hardcastle & Myerson Classification
Type A
  • Complete homolateral dislocation
Type B1
  • Partial injury, medial column dislocation
Type B2
  • Partial injury, lateral column dislocation
Type C1
  • Partial injury, divergent dislocation
Type C2
  • Complete injury, divergent dislocation

References

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