Meanwhile, in North America, the Steelers (of the NFL) just shut down (star player) Stephon Truitt for the season after a similar injury. It's a shame that sumo doesn't have the concept of "season-ending surgery."
Sumo is traditional. Traditional Chinese/Japanese medicine, including acupuncture, moxibustion, and shiatsu (which is organically Japanese) is traditional.
It's also a relatively non-invasive way to activate the placebo effect.