Working Diagnosis:
Left Mid-foot sprain
	
			Treatment:
Walking boot with goal of pain-free ambulation.
2 week follow-up
	
			Outcome:
Return  to clinic, still painful in walking boot.  MRI ordered, obtained 4 weeks after injury.  [Photo 2]  MRI showed occult oblique non-displaced fracture of cuboid.  Patient at time of MRI was pain-free in walking boot, swelling resolved, still with trace tenderness at cuboid.  Continued walking boot with transition to physical therapy and activities out of boot.  Patient returned in one month, 8 weeks after injury.  Had successfully transitioned to non-painful weight-bearing out of walking boot.  [Photo 3] Follow up x-ray 8 weeks after injury showed healing oblique non-displaced cuboid fracture.  [Photo 4]  X-ray one month later, 12 weeks after injury, showed complete fracture healing.  Patient continued to be pain free.
	
			Author's Comments:
Cuboid bone is essential for lateral column stability of the foot.  Isolated cuboid fractures are rare.  Only 1 case series of 10 patients documented in the literature.  Cuboid fractures are often misdiagnosed at lateral ankle sprains.  Medial oblique x-rays are the best way to visualize the cuboid bone.  Fracture of the cuboid can often be occult on initial x-ray study.  MRI or CT should be performed if clinically suspicious.  Cuboid fractures must be considered in plantar flexion and eversion injuries.
	
	
			References:
1.  Miller T., et al. Isolated injury of the cuboid bone. Emergency Radiology. 2002;9(5):272.
2.  Hunter J. A nutcracker fracture: cuboid fracture with an associated avulsion fracture of the tarsal navicular. Am J Roentgenol. 1996:166(4):888.
	
	
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