Ah, ok, I've googled some pictures and I think the difference is that Asian people squat flat footed like little kids do, while baseball catchers squat rather on the balls of their feet, probably to be more agile while catching the ball. So Asian people basically "hang down" from their lower legs with their knees almost above their feet and no tension on the femoral muscles which they don't need as for them it's a very stational position and baseball catchers rather sit "on" their lower legs with a lot of tension in their femoral muscles and their knees before their feet which combined puts a lot of pressure on the knees.
Yeah, by sitting flatfooted they effectively put the weight on their hips (haunches), a much stronger joint designed for such a purpose. Whereas by sitting on the balls of the feet, the player puts a lot of stress on the knee joint, and its connective tissues, which is why the movement of a squat accumulated over a very short time could cause a similar injury.
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