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Table 1 Evaluation of SBS scoring of the bone stock by Gruen zones

From: Differences between proximal bone remodeling in femoral revisions for aseptic loosening and periprosthetic fractures using the Wagner SL stem

Score Bone stock evaluation
+ 4 no damage or complete regeneration (density and thickness)
+ 2 moderate damage: decreased thickness or density or defects < 10 mms
0 severe damage: decreased thickness and density or defects > 10 mms
-2 major damage in density and thickness or cortical lysis