if we have back and leg pressed to wall that is stright up, then we can raise leg, but we will fall over since our center of ballance is off (normally, we would lean back to counter that weight of leg, but the wall prevents that)
if you want to be funny and sayy that you are lying down and your leg is agains the wall, then you can definitely raise your leg.
the answer ought to be yes, but not for very long (unless you are in space)
