Commentary for Chullin 151:20

הכא נמי מן הארכובה ולמעלה קתני

So, too, if the juncture of the tendons was gone [it is trefah]; and the actual joint meant is that [which was referred to in the statement] of Ulla in the name of R'Oshaia.<span class="x" onmousemove="('comment',' I.e., the knee-joint. And the law according to Rab Judah is this: If the leg was cut off at any point below the knee-joint and the tibia, which includes the juncture of the tendons, the animal is permitted; if cut off at any point above the knee-joint, i.e., in the femur, it is trefah. In the tibia would be trefah only if the leg was cut off at the juncture of the tendons, but if cut off at any point in the tibia above this juncture it would be permitted. Accordingly Rab Judah is in agreement with Ulla's view.');">¹²</span>

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