Dupuytren's contracture:

Flexion deformity in the hand due to palmar fascia fibrosis. Usually associated with alcohol or may be a hereditary disease. In this elderly lady it was neither - making it idiopathic.

BELOW: Profile of folded hands: The patient cannot fully extend the hand. This gives folded hands this appearance. It is obvious why it is also called the PRAYER sign. This sign is present in patients with RA too (but without the Dupuytren's).