I never spoke up last time as it seemed to me that fleecewife's advice would do the trick.
We get a few like this each year but they almost always just get better within a few days to a week as soon as you get them out on grass in the sun. So since to us the main treatment is sun, I thought I'd pipe up - massaging, splinting, bandaging, straightening -all must be helpful but possibly not if you are keeping them in (and out of the sun) in order to give all the physiotherapy!
It is pretty much always texel lambs that get it here.
The other thing I have sometimes wondered is whether odd shaped front legs in young lambs relate to assisted births. They always seem to straighten up ok so it's never been a problem that needed further investigation - but I'd be interested to know if anyone else has any views on this.