muscle strain

by vanessa
(phillipsburg nj)

i'm 27 yrs old. about 2 yrs ago i had my first hip replacement. i had hip displasia at birth so a replacement was long overdue. the first year was great. no problems, no pain, no nothing. i even joined the local ymca and worked out non-stop for 6 mos. then got lazy, that was this past summer.

since then i went out dancing with friends a few mos ago and was diagnosed with a muscle strain. that was my own fault. it eventually healed after a couple weeks. my problem now is, 3 days ago i was at work just walking around when all of a sudden i couldn't put any pressure on my left leg. i had a horrible sharp pain. my question is why does this keep happening to me? is it because i'm not as active as i was? maybe it wasn't healed all the way and i reinjured it? how long does it take to heal?