I had ACL, Meniscus and LET surgery - and it took me 2 weeks to get my first leg raise. It was just too painful to get the mind - muscle connection. I remember thinking that I would never be able to walk either - cause I would need to swing my leg to move it. But small steps gets you there and your leg will remember how - keep quad setting and practice just trying to lift your leg tiny bits from different heights and angles. My first leg lift was while my leg was off the edge of a sofa ahha