Metaphyseal corner fractures, also known as classical metaphyseal lesions (CML) or bucket handle fractures, are observed in young children, less than 2 years old. It is considered pathognomic for non-accidental injury (NAI).
This injury is not only the fracture most specific for NAI, it is also common among abused children, occurring in ~50% (range 39-59%).
The biomechanics of metaphyseal fracture is the cumulation of multiple microfractures across the metaphysis with an orientation perpendicular to the long axis of the bone. To-and-fro manipulation (shaking) is the force applied, for example holding the child around the trunk while shaking, with the limbs moving back and forth with a resultant whiplash, or shear force. The microfractures occur in immature mineralised bone.
This injury occurs almost exclusively in children under 2 years of age because:
- they are small enough to be shaken
- they cannot protect their limbs
Lucent area within the subphyseal metaphysis perpendicular to the long axis of the bone. The fracture extends across the metaphysis (completely or partially)
Like other fractures there is increased uptake of technetium-99m methylene diphosphonate. However, intense uptake of technetium-99m methylene diphosphonate at the metaphyses is normal in young children; abnormally increased uptake may be difficult to identify. Therefore scintigraphy is considered complementary only (as far as metaphyseal corner fractures are concerned).
- 1. Dwek JR. The radiographic approach to child abuse. Clin. Orthop. Relat. Res. 2011;469 (3): 776-89. Clin. Orthop. Relat. Res. (full text) - doi:10.1007/s11999-010-1414-5 - Free text at pubmed - Pubmed citation
- 2. Lonergan GJ, Baker AM, Morey MK et-al. From the archives of the AFIP. Child abuse: radiologic-pathologic correlation. Radiographics. 2003;23 (4): 811-45. Pubmed citation
- 3. Tenney-soeiro R, Wilson C. An update on child abuse and neglect. Curr. Opin. Pediatr. 2004;16 (2): 233-7. Curr. Opin. Pediatr. (link) - Pubmed citation