A
Rolando fracture is extra-articular, while Bennett's is intra-articular
B
Rolando fracture involves the base of the 5th metacarpal, Bennett's involves the 1st
C
Rolando fracture is a comminuted (Y or T-shaped) intra-articular fracture, while Bennett's is a two-part fracture-dislocation
D
Rolando fracture primarily affects the diaphysis of the metacarpal
Explanation:The correct option is 'c'. Both are intra-articular fractures of the base of the first metacarpal (thumb). A Bennett's fracture is a two-part fracture-dislocation where the volar ulnar beak remains attached to the anterior oblique ligament. A Rolando fracture is a more severe, comminuted intra-articular fracture, classically presenting with a Y- or T-shaped fracture pattern at the base.
Reference: Carlsen BT, Moran SL. Thumb trauma: Bennett fractures, Rolando fractures, and ulnar collateral ligament injuries. J Hand Surg Am. 2009;34(5):945-952.