Reference for Chullin 103:42

כי קאמר רב צלע בלא חוליא

And in speaking of most of the ribs on both sides it cannot be otherwise but that at least one rib was dislocated opposite the other!<span class="x" onmousemove="('comment',' For there are but eleven ribs on each side and twelve must be fractured or dislocated in order to render the animal trefah; hence the ribs on either side of at least one vertebra were dislocated.');">¹⁹</span>

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