Reference for Yevamot 205:8
אמר ליה רב אשי לאמימר והתניא בין עומד בין יושב בין מוטה אימא ולעולם דדחיס לכרעיה
Amemar further stated: A man who walks on the upper side of his foot<span class="x" onmousemove="('comment',' Owing to a deformity in his foot (cf. Rashi). [H], the 'fibula', 'splint-bone's 'his feet being turned outward so as to form an obtuse angle' (Jast.). ');"><sup>19</sup></span> must not submit to <i>halizah</i>. Said R. Ashi to Amemar: But, surely, it was taught: 'Supports of the feet';<span class="x" onmousemove="('comment',' Are among the objects that may be used as shoes for the purpose of halizah. ');"><sup>20</sup></span> does not [this signify] that such [a cripple]<span class="x" onmousemove="('comment',' In the conditions just described. ');"><sup>21</sup></span>