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Proposed classification for insufficient bone regenerate with intramedullary femoral lengthening
| Class | Defect length | Failure of bone regenerate formation | Defect character |
|---|---|---|---|
| I | Any | Partial failure of regenerate formation | Partial cortical defect |
| IIa | 3 cm or less | Complete failure of regenerate formation | Complete segmental defect |
| IIb | Greater than 3 cm | Complete failure of regenerate formation | Complete segmental defect |
