There was no way Tsunade would be able to have healed Oro's arms anyway.

[Beans2]

Tsunade is a great medical ninja, but there was no way that she could have undone Hiruzen's Reaper Death Seal on Orochimaru's arms.

Who else agrees?

 

[Dãrth1]

You can't heal a soul

 

[Uzumaki HAri]

Looks like you were seeing those episodes......

 

[Harsh srivastava]

she cannot undone it anyway. oro was fool to ask her

 

[Mad Daz]

Gotta agree with you OP. No way to get those arms back normally.

 

[Trúth]

Well i mean you cant heal a soul so yeah.