This does sound like splay leg. It's caused by his feet not being supported under him when his bones and joints are firming up as a baby. I had one finch who had it but, like you, didn't find him til it was too late to correct it. If found very early we can support that leg and make it grow straight, but it is too late now.

I agree that padded surfaces probably would be helpful to him. Some birds will perch on the good leg and grasp the cage side bars with the bad foot. If you can keep his toenails just the right length to allow him to grip but not be so long as to get snagged, vet wrap is a good perch wrap. Cheap enough to put new on every day or so. It sticks to itself but not to birdie feet. Farm supply stores and vets have it. Maybe pet stores, too.

Annie

I had a baby with a splayed leg also. Took her to the vet when she was only a few days old. He put a popsicle stick with bird safe tape onto her leg in order to help straighten it out. Oh dear, she ate it off a couple days later. Today she is going on nine years old. Little"Mary" is a real sweetheart and wow does she fly!. all in all I wouldn't waste the money I spent at the vet's office; had I known about the right kind of tape and the popsicle stick I'd have tried to straighten it out myself. Too bad that isn't her only handicap, she's also blind in one eye. Oh well, so WHO IS PERFECT? I love her to death and funny thing the vet did tell me she wouldn't live long. She has a little 4 inch mirror with perch on it that she sleeps on. she eats her pellets well, she has layed about 4 eggs over her lifetime. she loves to be cuddled and rubbed all in all I wish I had the three hundred dollars back that I paid the avian vet. but oh well; we live and learn. Best wishes to you and your dear little crippled baby. If you've got the money to blow- do take her to an avian vet, hear? Maybe with another set of hands you could "splint" the leg yourself. but better yet do get it looked at professionally to feel safer. Please ignore the address at the top of this page instead I [email protected] or mobilized parrot@birdbrainz

I have a M2 that her legs (when she was a chick) had been splinted by a reputable vet, only the owner was  lax in watching her and she now is permanently crippled to the point she walks on her hunches.....

I would no more take the responsibility of diagnosing/treating a injured leg on my children............. my birds have become my family, my children now.. Too2