No, Henderson has never defended his belt. He had a non-title match against Misaki at Bushido, then he had a minor injury and missed the 1st round of the WWGP. He entered the WWGP in the 2nd round and was matched up with Misaki again. He lost the 2nd fight with Misaki. After that he had a match with Vitor at PRIDE 32:The Real Deal. That fight was at 205, so the WW(MW) Title wasn't on the line. Now he'll fight Wand at 205 for a shot at Wand's belt. So it's been over a year since Hendo has won his title, but has still yet to defend it.