Mick Rathbone (ex physio) has spoken about this and said its a miracle he actually played as much as he did due to the pain this caused. Said it took them ages to diagnose this problem.Apart from when he led an awful team in 98 to survival, he was worth his weight in gold that season. Was also essential in 95 turning the team around. Played with an undiagnosed compressed sciatic nerve for years, must have been in constant.
But of course we aren't allowed to praise any players without some cry arse coming on and pointlessly comparing him to someone else, like you have to like one or the other.