Joint pain from Lipitor

My 55 year old husband was diagnosed with calcification in one of his arteries in March of this year. He is very athletic always kept himself extremely fit.  He was put on a dose of Lipitor of 20 mg and developed joint pain.  His doctor reduced the amount to 10 mg.  Now he is still experiencing extreme joint pain in his hip and has swelling of a finger joint and has injured his knee somehow without his knowledge. He has gone from a strong fit man to someone who hobbles around in less than 4 months.   Is the Lipitor doing damage to his joints as well as causing pain?  Is there any other medication with less side effects?  Thanks