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Table 5 Vancouver classification including B2 fracture pattern according to stem geometry (number and percentage within group)

From: Periprosthetic proximal femoral fractures in cemented and uncemented stems according to Vancouver classification: observation of a new fracture pattern

 Cemented, N = 84Uncemented, N = 88
Fracture patternComposite beam, N = 10Tapered, N = 74Wedge, N = 27Straight, N = 61
A1 (10%)11 (14.9%)4 (14.8%)14 (23%)
B12 (20%)13 (17.6%)3 (11.1%)8 (13.1%)
B2—burst1 (10%)17 (23%)2 (7.4%)0 (0%)
B2—clamshell0 (0%)1 (1.4%)10 (37%)20 (32.8%)
B2—reverse clamshell0 (0%)7 (9.5%)5 (18.5%)7 (11.5%)
B2—spiral4 (40%)14 (18.9%)3 (11.1%)4 (6.6%)
B31 (10%)3 (4.1%)0 (0%)0 (0%)
C1 (10%)8 (10.8%)0 (0%)8 (13.1%)