These past weeks dads legs lock with eachother in bed and always bent he can't seem to control them or lay them down anymore he is very stiff and painful when trying but it's almost like they are on a spring and they just fall back into right ankle locking under the other and when seated he has difficulty placing his feet on the ground and the left foot keeps rising .in February he was still geting about by himself and had none of these worries but since march the sudden change of not being able to and loosing co-ordination on how to turn sideways to toilet or to sit but now these past 3 weeks he can't walk at all and just about lifts himself up after so many attempts with help .so so worried. He's on memantine and we started then stopped then started again cos just wasn't sure if it was the drug causing this sudden change now we just don't know as when off them couldn't see any difference with walking but now this feet and legs locking is something else and he just never is comfortable now.does anyone else have this happening and when I told the memory doctor he said doubt the drug has caused this. Please advice. But I know also it is his Dimentia now and this is what's to come but I dread to face the truth and just hope there is improvement still and answer