I am amazed that a surgeon would put someone into a back brace for three months for standard lami - or was it a very unstable spine? Nobody here (four surgeons) would brace anyone - even three levels because of the inhibitory effect. Good luck,and I agree with scottthe physio - lots of trans abs, pelvic floor and multifidus work. Forget the old style back extensor regime and oblique abs, etc. Also lots of postural control retraining in sitting and standing and walking.