A patient has deep periodontal pockets, and a periapical radiograph shows a vertical root fracture. What kind of bone resorption pattern is associated with this?

A vertical root fracture allows infection/inflammation to track along the length of the fracture line, producing a narrow, vertical (angular/infrabony) pattern of bone loss following the fracture, rather than the more even, horizontal bone loss pattern seen in generalized periodontitis without a fracture.