T-9–T12 Laminectomy recovery

Husband had severe stenosis and nerve compression in T-9–T12. Had muscle weakness and wasting in legs and lost ability to walk without a walker. 11 weeks post laminectomy..started making progress and better leg mobility and this week both legs feel weaker and he has had increased muscle spasms/jerking of his legs. Is this a normal a
progression? 2 steps forward and 1 seep back…have any of you experienced this and what was the end result?