Building arm muscles after humerus lengthening

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Yes, a rehabilitation process is necessary. Let's say a year has passed since humerus lengthening surgery and a regular lengthening of 7 cm has been achieved in the arms (3.5cm per arm)  . Will this person be able to develop arm muscles like a normal person, and lift weights? I've searched the forum quite a bit, but this hasn't been addressed at all.

Leg muscles aren't a major focus, so they're not a topic discussed after leg lengthening surgery, but arm muscles are important. Can anyone with knowledge shed some light on this?

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Because the muscles are being stretched, I'm worried that if muscle tissue is added to the humerus side, it might look misshapen.