I wasn't aware that he was injured. What happened? I saw that he fell in the rankings and just attributed it to advancing age - LOL.
It all started with the Woman's coach Kong having legal trouble with some casino. He was surprisingly suspended during the WM in Germany. Then the overall Men's coach Liu Guoliang, who is mainly responsible for the success of the modern Chinese dominance, he studied the european tricks of Waldner and Co and brought them back to China, he was the personal trainer of Ma Long with his european topspin style, got demoted, which was mostly a political power struggle amongst the buerocrats. Liu Guoliang became too powerful, and the vice major of Bejing got him demoted.
But then some surprise happened and the top 3 players, Ma Long, Fan and one more protested officially, which didn't play well with the officials, and so they all got banned. Also the ITTF rating changed that not the best but the most active have the most points, the Chinese players having an enormous disadvantage, because their tournaments didn't count, only the europeans. So with the ban and the ratings Ma Long fell to #11, even he still was the best player in the world. Then he announced an injury, and after a series of more mishaps in the team, they lost in Japan against the young Japanese - remember Tokyo will have the next Olympics, Liu Guoliang was reinstated as special Olympics coach. Ma Long came back and won.
I have enormous respect for Ma Long to fight the buerocrats. They could have ended his career, not only Liu's and Kong's. Now it looks like the experts do have their say again.