Glad he is doing well.
Please listen to all the good advice here. Bi-laterial LP surgery is nothing to mess around with, keep him contained for the minimum of 8 weeks, as each week goes by give him a little more walk time during potty.
When Roxy had her legs done (both at the same time), she was ready to run and play at 2 weeks so be prepared to play "Bad Momma" and keep him contained.
I used a baby blanket (from the dollar store) as a sling to hold her mid section to do potty
P.S. Did the surgeon to the Cut & Pin type of LP surgery OR did he only deepen the groves ????