Derek Donegan, Michael Huo, Michael Leslie
Intraoperative fractures occurring during removal of the acetabular components are classified as Della Valle II. The fracture pattern can be simple or complex.
Type IIA patterns involves less than 50% of the acetabular bone stock. Type IIB involves more than 50% of the bone stock.
Further information about Della Valle classification can be found in the publication: Della Valle CJ, Momberger NG, Paprosky WG. Periprosthetic fractures of the acetabulum associated with a total hip arthroplasty. Instr Course Lect. 2003;52:281–290.