<unk>  is an rare syndrome affecting women that is characterized by symmetric joint effusions, predominantly involving the knees, without joint destruction. These effusions occur periodically, with recurrent self-remitting episodes of acute arthritis often monthly at or around the menses.
Intermittent hydrarthrosis
Repetitive strain injury
Metastatic calcification
Occult fracture
Fracture nonunion
Capsular contracture
Avascular necrosis
Heterotopic ossification