my left elbow normally works fine but if i've been holding something (not necessarily really heavy) in the same position for a while, eg. shopping bag/baby/rubbish bag, then when i try to put it down my elbow locks halfway there and i can't move it. not normally a big problem as i generally can drop whatever it is and as soon as the weight has gone my elbow will straighten but when carrying a 33/40 wk tiny baby as us neonatal nurses tend to and trying to put it back in its incubtor, it can be a bit of an issue! : S generally a cry of 'err, will someone put the baby back please?' sorts us out tho. : )