Tip toe walker, bad dorsiflexion & Tight Calves - Pre-LL

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As the title suggests, I have really bad flexibility, tight calves and probably short achilles tendon due to my tip toe walking habit.

I want to get 8 cm done on my femurs. Is it possible ? Will I encounter problems ?

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Eyes are feeling better, but legs could be 8 cm longer 

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That's good to know. I'm only worried that I won't be fit for the surgery because of my achilles tendon or calves. I also don't want to mess with my tibia for that reason so I will only do femur LL, (7-8cm)

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I know there are stretches you can do for calves but I don't know if stretching help with short achilles tendons