Progressive stiffening of a joint is seen in -

ADHESIVE CAPSULITIS (FROZEN SHOULDER) The term 'frozen shoulder' should be reserved for a well-defined disorder characterized by progressive pain and stiffness of the shoulder which usually resolves spontaneously after about 18 months. The cause remains unknown. The histological features are reminiscent of Dupuytren's disease, with active f ibroblastic proliferation in the rotator interval, anterior capsule and coraco-humeral ligament . The condition is paicularly associated with diabetes, Dupuytren's disease, hyperlipidaemia, hypehyroidism, cardiac disease and hemiplegia. It occasionally appears after recovery from neurosurgery REF:Apley&;s system of ohopaedics - 9th edn-pg no 351.