Which method is safer: Internal Nail for femurs VS External Frames for tibias

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I did some research on the safest method for LL. Based on what I found, the safest way to lengthen the tibia is through external frames. However, when it comes to both femurs and tibias, I would like to know which method is safer: internal nail for femurs or external frames for tibias?

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Internals have much less chance of infection.

Femurs (compared to tibias) have many more blood vessels, thus healing is much quicker. Furthermore, in femurs you only break 1 bone per leg, compared to tibias that breaks 2 bones per leg.