Idiopathic inflammatory myopathies are a group of chronic, autoimmune conditions affecting primarily the proximal muscles. The most common types are dermatomyositis, polymyositis, necrotising autoimmune myopathy and sporadic inclusion body myositis (IBM).1 It seems that inclusion body myositis has a prominent degenerative component.2
This is a companion discussion topic for the original article at https://patient.info/doctor/rheumatology/inclusion-body-myositis