Tarsal Navicular

(see also: Accessory Navicular; Kohler's Disease I)

Anatomy

• navicular joins in front w/ medial, intermediate, & lateral cuneiform bones, which articulate anteriorly w/ first, second, and third metatarsals;
• navicular provides insertion for tibialis posterior;
• blood supply to the navicular bone is radial and extraarticular & is subject to loss both at time of injury & at time of surgical rx;

Fracture

• navicular stress frx
• cortical avusion fractures
• body fractures
• longitudinal stress injuries of midtarsal joint
• dorsal lip frx:
  • look for assoc ankle sprain;
  • w/ large lip frx or mid tarsal joint injury, then consider SLC;
• fracture dislocation

Assoc Injuries

• Midfoot/Forefoot Fractures
• Midtarsal Injuries

References

• Displaced intra-articular fractures of the tarsal navicular.
• Surgical reconstruction for calcaneonavicular coalition. Evaluation of function and gait.