Ahhh sweety....I suspected CDH (Congenital Hip Dysplasia) when you wrote to me about the clicky hip thing, but thought and hoped...well, maybe it means he's chasing little girls (in Ozzie-speak).
Now I learn this. Well, in plaster pants he's almost as much a threat as his grandpa....watch out for the shrapnel, and don't under any circumstances let Mark (me Bonzer mate, a.k.a. Cap'n starkers) to feed Decon anything looking even vaguely like you know what.
So much for my feeble attempt at humor and cheer for a worried Grandmother.
All will be well, and he'll be tooting with his Grandfather in no time at all.
Also, I spent my first year on this planet in plaster as well...Pes Equino-Varus. I was so pidgeon-toed I gave the birds a bad name.
My best thoughts are with you (as if I had to say), and prayers and above all, love. Hugs and kisses to the little tyke, as well. 
