(Chapter 33) Footnote 40:

a)stra/galoj is properly the ball of the ankle joint, as opposed to the sfuro/n, the ankle as a whole, acc. to Rufus’ Onomasticon124. a)/strion in the sense given here is unattested in the TLG Canon of medical writers, Pollux, or LSJ. The end of this section, beginning with the reference to Aristotle and Galen, was deleted from the 1555 edition; the Greek names were moved to the first sentence of the section which follows.