Final answer:
The term for an oblique fracture of the base of the first metacarpal is a Bennett's fracture, not to be confused with a Colles' fracture, which is a different type of injury of the distal radius.
Step-by-step explanation:
The term for an oblique fracture of the base of the first metacarpal is a Bennett's fracture. This injury is distinct from a Colles' fracture, which is a break of the distal radius, often caused by falling onto an outstretched hand and resulting in a characteristic "dinner fork" appearance. A Boxer's fracture, on the other hand, refers to a break of the metacarpal bones that form the knuckles and is typically sustained from punching an object.