Fractures involving the base of the metacarpal bone for the thumb can be divided into 4 basic types.
Basic types:
(1) epibasal
(2) Bennett's
(3) Rolando
(4) comminuted
Type
Number of Bone Fragments
Description
epibasal, transverse
2
horizontal to the base, extra-articular
epibasal, oblique
2
at an angle to the base, extra-articular
Bennett
2
intra-articular
Rolando "Y"
3
element parallel to long axis intra-articular; fracture line running perpendicular to the long axis of the bone is at an angle to the base, giving a "Y" shape
Rolando "T"
3
element parallel to long axis intra-articular; fracture line running perpendicular to the long axis of the bone is horizontal to base, giving a "T" shape
comminuted
> 3
intra-articular with multiple fragments
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