Even in rugby, a game known for its strange and often highly specialised specimens, medical jokers are a rare and unusual breed. What makes them tick? In 2014, I asked one…
They are super-powered chameleons, 
ready, willing and able to leap on to the nearest plane heading in roughly the right direction at almost no notice to take up a short-term contract with a club that is desperately seeking player cover.
Their job is to fit in with their new team – fast – and fill a hole until it is mended.
Sometimes, they fill the hole so perfectly that what starts as a short-term, typically three-month, medical joker contract turns into a permanent deal
James Harrington: Freelance sports journalist 