The phrase “which raises the possibility” says no more than “, possibly”. 

A hand surgeon taught me to just say thumb, index, middle, ring and small (or little) to describe the fingers. There is never any confusion and it’s no harder. No advice for the toes other than “great” or “hallux”, then second, third etc. 

It’s plausible that for such simple findings and diagnosis the impression could contain both. The example sentence was just a report impression. The radiographic findings of a luceny were well-described in the “findings” section and didn’t need to be repeated. I think it’s better said:  “Possible nondisplaced fracture base of the distal thumb phalanx, as above.”