Definition of Knit (verb)

Let's take a look at the word knit in verb form.

Transitive verb

• chiefly dialect : to tie together
• to link firmly or closely, knitted my hands
• to cause to grow together, knit a fractured bone
• to contract into wrinkles, knitted her brow
• to form by interlacing yarn or thread in a series of connected loops with needles

Intransitive verb

• to make knitted fabrics or objects
• to become compact
  
• to grow together
  
• to become drawn together

I think that the definition (besides the practice of knitting itself) "to cause to grow together" is the most interesting. In looking at science knitting articles, I have found the word used a lot in cases with broken bones, so the example found in the dictionary is fitting.