<unk>  is uncommon and its prevalence is not known. (In 1974 more than 200 cases were reported in published literature). It affects men and women equally although some publications suggest the condition is slightly more prevalent in females. Case reports indicate that only white people are affected. First onset of IH is most common between the ages of 20 and 50 years, and in females, onset can often coincide with puberty. Usually the condition begins spontaneously or following trauma to the joint in otherwise healthy individuals.
Intermittent hydrarthrosis
Neuralgia-inducing cavitational osteonecrosis
Complications of prolonged standing
Progressive osseous heteroplasia
Repetitive strain injury
Microdamage in bone
Articular cartilage damage
Metastatic calcification