The hip joint in Paget's disease (Paget's "coxopathy").

Three hundred patients with Paget's disease around the hip joint are compared with 300 control patients who did not have Paget's disease. The incidence of joint degeneration in the two groups is similar at all ages, and there appears to be no predisposition to joint degeneration in patients who have Paget's disease. A feature of the hip joints is that in approximately half there is joint narrowing to less than 3 mm affecting a portion or the whole of the joint surface, which, together with the incidence of protrusio acetabuli, is probably a specific manifestation of the joint changes associated with Paget's disease.