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| Periosteal callus | |
| Subjective size and quality | Minimal/mild = 3; prominent, well organized = 2; prominent disorganized = 1; incomplete union = 0 |
| Woven-lamellar bone percent | 0–25% = 3; 25–50% = 2; 50–75% = 1; 75–100% = 0 |
| Cartilage tissue percent | 0–25% = 3; 25–50% = 2; 50–75% or incomplete union = 1; 75–100% or fibrous nonunion = 0 |
| Fibrovascular tissue percent | 0–25% = 3; 25–50% = 2; 50–75% = 1; 75–100% or fibrous nonunion = 0 |
| Inflammation percent | 0–25% = 3; 25–50% = 2; 50–75% = 1; 75–100% = 0 |
| Osteotomy site | |
| Bridging bony callus percent | 75–100% = 4; 50–75% = 3; 25–50% = 2; 10–25% = 1; 0–10 = 0 |
| Woven-lamellar bone percent | 0–25% = 3; 25–50% = 2; 50–75% = 1; 75–100% = 0 |
| Mineralized bone percent | 75–100% = 3; 50–75% = 2; 25–50% = 1; 0–25% = 0 |
| Fibrovascular tissue percent | 0–25% = 3; 25–50% = 2; 50–75% = 1; 75–100% or inflammatory exudate = 0 |
| Inflammation percent | 0–25% = 3; 25–50% = 2; 50–75% = 1; 75–100% = 0 |
| Adjacent cortical bone | |
| Degree of osteolysis | None/minimal = 4; mild local expansion (remodeling) of osteonal canals = 3; <1 mm adjacent osteolysis = 2; 1–3 mm adjacent osteolysis = 1; >3 mm adjacent osteolysis = 0 |
| Extent of bone necrosis | Empty lacunae and/or necrotic osteons: <2.5 mm = 4; 2.5–5 mm = 3; 6 mm–10 mm = 2; 11–20 mm = 1; >20 mm = 0 |
| Extent of inflammation | None/minimal = 4; mild local ostonal canals inflammation = 3; inflammation >1 mm distance = 2; 1–3 mm distance = 1; >3 mm distance = 0 |
| Presence of sequestra, for example, necrotic fragments of bone | None = 8; 1–3 small <2 mm = 4; >3 or single large >2 mm = 2; single to multiple large >5 mm = 0 |
| Presence of bacteria | None = 8; rare small colonies = 4; multifocal colonies (<25 µm) = 2; multifocal large colonies (>50 µm) = 0 |
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