Throughout Boruto: Naruto Next Generations, Sasuke is always seen with one arm. He lost it during his final battle against Naruto, but why didn’t Sasuke get a new arm?
Sasuke didn’t get a new arm because he wanted to see the shinobi world as his current self. He was pardoned for his crimes and left the village in chapter #699 for “a journey of atonement.” Getting a new arm would symbolically disrespect his self growth and acknowledgement of his troubled past.
Naruto did receive a new arm made from Lord Hasirama’s cells.
Plot Behind Why Sasuke Didn’t Get A New Arm
In chapter #699, as thanks for undoing the Infinite Tsukuyomi, Sasuke was pardoned for his crimes committed prior to the Fourth Ninja War. A good word from war hero Naruto and Hokage Kakashi helped the pardons go through.
He decides to leave the village behind on a personal journey.
You really insist on leaving? The artificial hand Lady Tsunade is crafting from Lord Hashirama’s cell will be ready soon.
Sakura to Sasuke | Chapter #699
Sakura said her final goodbyes to Sasuke, pleading with him one last time to join on his travels. He turned her down, explaining that she shouldn’t suffer for his crimes and live such an isolated existence as well.
I want to know how the shinobi world… How this world looks to the current me. I feel like I’ll now be able to see the things I overlooked. Things that I can only perceive in my current state. And… There’s a matter that’s been weighing on me. It’s a journey of atonement too. And you have nothing to do with my crimes.
Sasuke to Sakura | Chapter #699
Sasuke would never get his appendage back for the remainder of Naruto Shippuden, as well as Boruto. Even as the show has gone on and Sasuke becomes increasingly more reformed, he still never reaches out for a new prosthetic appendage. He may feel that his journey of personal atonement for his wrongdoings is yet to be satisfied.
That’s the answer. Sasuke didn’t get a new arm because he wanted a constant reminder of his troubled past. His self journey of personal atonement would feel cheated by replacing the lost arm which represented the build up of all his sins.