Hydrarthrosis refers to recurrent pattern of Joint effusions , usually of the
   knees , of long term , even life long duration. These recurrent attacks usually
   maintain a predictable preiodicity. In this rare case report we describe a
   patients with charactristic clinical manifestation that can be differentiated
   with initial symptoms of very common rheumatologic disorders such as R.A
   and sero negative spondyloarthropathy.