He sprained/pulled a muscle in his leg a few months back, and even after he was all better, he kept posing with his little leg sticking out as if to say "Look Mommy, it hurts, worry about me now."
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Sorry your pup was diagnosed with Luxating patella, its ideal to find out what grade or level of LP your pup has. Holding the leg up while walking is A sign of LP it could be a level 3 & up. There is something else inside the knee that can break with an injury and sometimes gets diagnosed as LP, it can be repaired I just can't remember the name of it at this moment. Will research and get back to you. Brain cramp, uuughhh.