How dare you even ask that question!! Rock Lee is not some chump girly-man that lays in a bed all day when hes injured (...sasuke...), no, Lee would rather be outside doing pushups. There is no way Lee wouldnt take the operation, hes just waiting a bit, trying to get a little bit more play from sakura (possibly to silence the growing rumors of a...special relationship between him and Gai...or just get her off sasuke's nuts a litte).