Loss of power to move in any or every part of the body

One word substitute is Paralysis.

Rheumatism: any disease marked by inflammation and pain in the joints, muscles, or fibrous tissue, especially rheumatoid arthritis.
Paralysis: the loss of the ability to move (and sometimes to feel anything) in part or most of the body, typically as a result of illness, poison, or injury.
Eczema: a medical condition in which patches of skin become rough and inflamed with blisters which cause itching and bleeding.
Leprosy: a state of corruption or decay.