Safety and reported deaths

 In Japan, 114 child judo deaths have been reported in a 27-year period between 1983 and 2010.
Adult competitive judo has a higher incidence of injuries compared to non-collision or non-contact ball-sports for example, but similar to other competitive contact sports.
In Judo, a majority of the time Judoka are taught to fall properly, although not many players actually use breakfalls in competitive judo (at a competition) as it is basically slamming your hand on the mat indicating to the referee that there has been an ippon scored.

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Chokes

 

 Although chokes are potentially lethal techniques, a properly applied choke hold, if released soon enough after submission or unconsciousness, causes no injury. Judo chokes are generally taught to the more experienced Judoka to help ensure the safety of the students.
There is ample data demonstrating the safety of applying chokeholds, and training includes emergency care and resuscitation (kappo).

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Throws

 

 A properly applied throw performed in a controlled way should protect the opponent from injury.
However injuries may result if, for example, the thrower (Tori) lands on the opponent (Uke) as a result of a sloppy or intentionally malicious throw, or if the tori performs a sloppy throw with disregard for uke's joints (e.g., improper Osoto gari or Tai otoshi applied with lateral force to the knee; or sloppy Soto makikomi or "drop" Ippon seoi nage resulting in excessive forces into uke's shoulder). To best prevent throwing injuries, proper throwing techniques should be thoroughly drilled by teachers before entering students into competition—via "fitting-in" drills (Uchi-komi's), prearranged forms (e.g., Nage-no-kata), and intense but controlled & supervised free-practice/sparring (Randori).

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