Definition of Arthritis mutilans

Arthritis mutilans: An extremely severe form of chronic rheumatoid or psoriatic arthritis characterized by resorption of bones and the consequent collapse of soft tissue. When this affects the hands, it can cause a phenomenon sometimes referred to as 'telescoping fingers.'

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=25247
Last Editorial Review: 3/19/2012