Veteran rocker Brian May underwent a scan at a hospital in London on Monday morning (16Dec13) as he struggles to recover from a recent knee operation. The Queen star underwent knee replacement surgery in August (13), but revealed to his Twitter.com followers this week (beg16Dec13) that he is still enduring crippling pain. May also explained he has been suffering pain in his buttock muscles since an appearance at a music festival in Las Vegas in September (13), and his day was made worse when his cell phone broke. He writes, "I'm having a bad day. Knee pain now dwarfed by crippling pains in glutes (gluteus maximus muscle), which I've had since Vegas iHeart (festival). Then my iPhone died. Great... Got myself an MRI (magnetic resonance imaging scan) this morning. Could hardly walk. I hope I am as fixable as my iPhone!"