Sasuke has a story of vengeance that later turned into the ultimate tragedy. He also has one of the most popular backstories in anime history.
Sasuke is from the great Uchiha clan, one of the most powerful, noble, but almost-extinct clans in the land of Konoha.
His Kekkei Genkai allows him to use Sharingan, a very powerful dojutsu.
He later activated Eternal Mangekyou Sharingan using his brother Itachi’s eyes and then received a Rinnegan from Hagoromo Otsutsuki himself.
Given his strengths, how did Sasuke lose his arm?
Sasuke lost his left arm in episode 476, The Final Battle, during his final fight with Naruto to settle their unfinished business once and for all.
While Sasuke and Naruto were coming at each other with Chidori and Rasengan, respectively, they clashed with immense force, and both lost one of their arms in the process.
After the fight, Sasuke finally comes to his senses and accepts Naruto’s friendship.
Together they free everyone from the chakra tree, thus saving the whole shinobi world.
After saving Konoha and the shinobi world, Sasuke once again leaves Konoha to complete a series of dangerous S-ranked missions as a form of punishment for his crimes.
If Kakashi and Naruto didn’t interfere with his trial, Sasuke’s punishment would have been more serious which had a good chance to end in the death penalty.
Does Sasuke regrow his arm?
The prosthetic hand Tsunade was working on was still in the making, so Sakura asked Sasuke to wait for a few days, but Sasuke politely declined the offer.
The Uchiha clan never had any regeneration abilities. As Sasuke declined his prosthetic arm, he never regrew it.
He left Konoha without doing anything about his arm and carried on his missions with one arm.
Why Did Sasuke Decline a New Arm?
Sasuke not accepting a new arm that Tsunade prepared for him was a way of repenting for his sins.
After all the melodrama in Sasuke’s life, the wrongs that had been done to him, and the crimes he had committed, Sasuke finally realized that life can not go on driven by revenge and solitude only.
As soon as the realization hit him, so did regret.
He decided to view the world from other people’s perspectives and live the life that Itachi wished for him.
Will Sasuke Get His Arm Back in Boruto?
No, as far as the Boruto: Naruto Next Generation has progressed, there are no signs showing that Sasuke will get his arm back in the future.
Even without a hand, Sasuke is extremely skilled with his Katana, and his Eternal Mangekyou Sharingan makes up for where he is lacking.
He has learned to use one-hand seals which enables him to use his trademark attack Chidori.
Will Sasuke Get a Prosthetic Arm?
No, Sasuke will not get a prosthetic arm. Sasuke not getting a prosthetic arm is a matter of choice, a choice he made a long time ago.
And to carry on with his shinobi life with one arm, Sasuke has trained himself very well to use one-hand seals and other taijutsu techniques.
How Did Naruto Get His Arm Back?
Naruto never got his actual arm back. The hand that is shown in Boruto and at the end of Naruto Shippuden, is actually a prosthetic arm created by Tsunade using Hashirama cells.
Hashirama Cells are the cells from the first Hokage (Shodaime) Senju Hashirama, who was known for his immense healing abilities.
The secret of this powerful ability lies in the very cells of Hashirama, the source of which was most probably his Kekkei Genkai, wood style.
Tsunade, the greatest medical ninja of her time, used her late grandfather’s cells and created a prosthetic arm for Naruto.
We have also seen Uchiha Obito and Uchiha Madara using Hashirama cells to heal wounds and make prosthetic arms and legs.
Is Sasuke Still Strong with One Arm?
Living with only one arm is definitely challenging, especially if you live in the dangerous Shinobi world.
Sasuke is no regular ninja. He is the last pure blood survivor of the Uchiha clan who has one Eternal Mangekyou Sharingan, one Rinnegan, along with Kakashi and Orochimaru’s training.
Sasuke is still very strong even without his left arm.
Though not having one arm, Sasuke can still use the Six Paths Technique, Amaterasu, basic Sharingan abilities, and a complete Susano.
Read more: Does Sasuke Die in Boruto?