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Table 3 Scoring system for resistance-to-removal (RTR) and attached bone remnants (ABR)

From: A new model of implant-related osteomyelitis in the metaphysis of rat tibiae

Score RTR ABR
1 Loose screw can be removed with forceps only No bone detectable on implant
2 Little resistance (only tip of 2 fingers needed to hold screwdriver) Traces of bone remnants on implant
3 Moderate resistance (screwdriver held in pinch grip) Thin bone layer on implant (10–25 % of surface coated with bone)
4 Strong resistance (like 3 but more power needed) Moderate bone layer on implant (25–50 % of surface coated with bone)
5 Bone fracture with screw partly covered by bone Thick bone layer on implant (>50 % of surface coated with bone)