"God is guarding all the bones of that one; not one of them has been broken." (Ps. 34:20)
As prophesied, the Messiah would be pierced, but his bones would not be broken. Inhabitants of Jerusalem would “look to the One whom they pierced through,” says Zechariah 12:10.
Confirming these points, the apostle John wrote: “One of the soldiers jabbed his [Jesus’] side with a spear, and immediately blood and water came out. And he that has seen it [John] has borne witness, and his witness is true . . . These things took place in order for the scripture to be fulfilled: ‘Not a bone of his will be crushed.’ And, again, a different scripture says: ‘They will look to the One whom they pierced.’”—John 19:33-37.
http://wol.jw.org/en/wol/dt/r1/lp-e/2013/1/21