Table 3.

Comparison of the original Vancouver classification system of periprosthetic fractures and our modified version*

Vancouver classification	Description	Our modified Vancouver classification	Description
ATG	Fracture in greater trochanteric region	TG	Same as original
ATL	Fracture in lesser trochanteric region	TL	Same as original
Pseudo ATL/new B†2	Fracture of the lesser trochanter, includes a segment of the proximal medial femoral cortex, is associated with destabilization of the stem. and requires early reintervention	A1	Fracture of medial cortex that includes the residual neck, calcar, and lesser trochanter and is displaced medially, with a well-fixed stem
		A2	Fracture of medial cortex that includes the residual neck, calcar, and lesser trochanter and is displaced medially, with a loose stem
B1	Fracture around stem or just below it, with a well-fixed stem	B1	Same as original
B2	Fracture around stem or just below it, with a loose stem but good proximal bone stock	B2	Same as original
B3	Fracture around stem or just below it, with poor-quality or severely comminuted proximal bone	B3	Same as original
C	Fracture well below prosthesis	C	Same as original

* See illustrations of our modified Vancouver classification in Figure 2; ^†modification added by Van Houwelingen and Duncan [14].