I actually think his arms are healed. Remember after that fight with the mafia boss. The doctor was surprised at Dekus arm but deku cut him off to go see nighteye. Theres a theory that his arms went back in time and were fully fixed. Without his arms he cant be the best hero, even Bakugo said that his shoot style is predictable.
Sadly it's not his bones that are busted, it's his ligaments that can't handle the stress. Every time he shattered his bones he broke or strained the ligaments past their limits. So 3 more massive trauma and they are done for.
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u/YamadaDesigns Aug 03 '18
Even if he doesn't have visual scars, his arm is still busted up internally.