**Question:** Bennett's fracture is fracture dislocation of base of --- metacarpal:

A. Hypothenar
B. Dorsal
C. Palmar
D. Trapezium

**Correct Answer:** C. Palmar

**Core Concept:** Bennett's fracture is a specific type of fracture dislocation involving the first three carpal bones and the ulna, characterized by fracture and dislocation at the base of the fifth metacarpal.

**Why the Correct Answer is Right:** Bennett's fracture occurs due to the flexion, radial deviation, and ulnar tilt forces acting on the wrist joint. These forces cause the fracture to involve the base of the fifth metacarpal bone, resulting in both fracture and displacement of the fifth carpal bone from its normal position. This type of fracture is named after Sir James Bennett, who first described the injury in 1939.

**Why Each Wrong Option is Incorrect:**

A. Hypothenar: Bennett's fracture is not related to the hypothenar eminence, which is a group of muscles and tendons located on the palmar surface of the hand.
B. Dorsal: Bennett's fracture is not located on the dorsal aspect of the hand, as it occurs on the palmar side of the wrist and hand.
D. Trapezium: Bennett's fracture involves the fifth carpal bone (scaphoid) and the fifth metacarpal, not the trapezium.

**Clinical Pearl:** Bennett's fracture is a common injury in sports and occupations involving repetitive forceful activities of the wrist and hand, such as sports like tennis, golf, and manual labor tasks. Early recognition and treatment are crucial to prevent complications like angulation, shortening, and loss of function in the affected digit.