The injury prevented him from playing in eight straight tournaments, the worst record of any grand champion.
He returned to the elite level last September but a string of eight losses has led to him to withdraw from professional sumo wrestling.
“I was delighted when he became yokozuna but when you see him closely, you can tell that he was struggling a lot. These two years went like a flash,” his stable master Tagonoura Oyakata said yesterday.
“He made a big decision. I can tell straight away by looking at his face that there were many thoughts on his mind.
“I personally cannot take it in.”