"Mick Mars has been pretty ill for a long time and just to get him onstage is probably an effort. He is hardly likely to be propping the bar up until three in the morning after a gig." Def Leppard star Joe Elliott doesn't expect his band's upcoming British tour with Motley Crue to be a wild one. The band's guitarist, Mars, suffers from ankylosing spondylitis, a form of arthritis that affects the spine and pelvis.