A wrist fracture, specifically a distal radius fracture, refers to a break in the radius bone close to the wrist joint; therefore, it doesn't have a radius in the geometric sense. The term "radius" in this context refers to the name of the bone, not a measurement.
Therefore, there is no "radius of a wrist fracture" to measure. The question is based on a misunderstanding of the term "radius" in the context of anatomy.