As for Murali having a medical condition that did not enable him to straighten his arm...what codswallop! To bowl leg spin, you can only do it with a straight arm. You simply cannot chuck a leg break. Here is Murali showing that he actually COULD bowl with a straight arm...he simply chose not to for the majority of his career:
Condition of his arm explained , and Mark Nicholas trying to extend it himself.
Leg break getting called (watch from 3.25) , but you say leg breaks cannot be chucked, Which bring questions about the umpire and his motives..
in another thread tim2000 says leg break can be chucked, I tried but I can't do that. but maybe others can. who knows.
Simply not true. Try it. If you flex your elbow you can increase the twisting action through your wrist, so it's very possible...
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Also it's not the bend which cause issues, it's the flex .