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Table 1 The 10 types of regenerate quality observed on radiographic morphology, arranged by density based on the Li classification [[12]]

From: Prophylactic titanium elastic nailing (TEN) following femoral lengthening (Lengthening then rodding) with one or two nails reduces the risk for secondary interventions after regenerate fractures: a cohort study in monolateral vs. bilateral lengthening procedures

Regenerate feature Low Intermediate Normal
Sparse Type 1 Type 5
Homogeneous Type 2 Type 6 Type 9
Heterogeneous Type 3 Type 7 Type 10
Lucent Type 4 Type 8