A
The fracture is strictly proximal to the stem with a well-fixed implant.
B
The fracture is well distal to the tip of the stem.
C
The fracture occurs around the stem, and the femoral component is loose with adequate bone stock.
D
The fracture occurs around the stem, the stem is loose, and there is severe bone stock loss.
Explanation:Correct Option: C. The Vancouver classification defines Type B fractures as occurring around or just distal to the stem. A B1 fracture has a well-fixed stem (treated with ORIF). A B2 fracture has a loose stem but adequate proximal bone stock (treated with revision to a longer, bypass stem). A B3 fracture has a loose stem with severe bone loss (treated with proximal femoral replacement). (Ref: Duncan and Masri, Instr Course Lect, 1995)