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The femur-graft-tibia complex was fixed in custom iron tubes and clamped to an Instron machine for biomechanical testing (a, the black arrow points to the graft). The average failure load in the HA group was significantly greater than that in the S group at 16 weeks postoperatively (b). A significant difference in stiffness was also detected between the two groups (c). Asterisk indicates a significant difference between groups
