and hug for the failed lateral release (which pity enough seems common to fail in bendies) and your situation/difficult decision!
sorry I have no surgery advice-hopefully someone else will!-
just a wee forum usage advice... when you wonder whether something's already been talked about... use the search facility (top right hand corner of page)- if a 'general' search brings up too many posts, try the advanced search to narrow it down; if nothing comes up try playing around with the keywords for search etc etc
putting 'tibial tubercle transfer' in the general search box brings up the "knee surgery-good idea or bad?" thread - and you'll find Amy who it seems has had this procedure with some success- maybe you can pm (private message) her to find out more-
and a v short "TTT and muscle spasms" thread.
oh and the 'eternal' questions... have you extensively tried physio ? tried any orthotics ? I know this would all take time and you're hoping for a fairly quick solution, but sometimes... quick isnt best
ps just 'played around' with spelling and 'Tibial Tubercule Transfer' brings up another thread, as does 'TTTs' and then I noticed oops if you just scroll down the knee surgery subforum thread headings... they're all there