The exact prevalence of<unk>  in general population is unknown, and this condition is often considered a rare disease by nonrheumatologists. However, recent Canadian study showed that the incidence of PR in a cohort of incident arthritis was one case of PR for every 1.8 cases of rheumatoid arthritis (RA). The incidence of PR is less than that of RA but is not as rare as that was thought to be.<unk>  is a syndrome presented with inflammatory para-arthritis (soft tissue<unk>  and inflammatory arthritis both of which cause sudden inflammation in one or several joints or soft tissue around joints. The flares usually present with mono- or oligo-articular involvement, which have onset over hours and last a few hours to a few days, and then go away completely. However episodes of recurrence form a pattern, with symptom-free periods between attacks lasting for weeks to months. The most commonly involved joints were knees, metacarpophalangeals and proximal interphalangeals. Constitutionally, there may or may not be a fever, and swelling of the joints. The soft tissues are involved with swelling of the periarticular tissues, especially heel pads and finger pads. Nodules may be found in the subcutaneous tissues. The frequency of attacks may be variable over the course but there is no joint damage after attacks. It typically affects people between the ages of 20 and 50. One study showed an average age of onset of 49. A population cohort study in Taiwan suggested that patients with PR had an increased risk of developing rheumatoid arthritis, systemic lupus erythematosus, Sjogren's syndrome, systemic sclerosis, and polymyositis.
Palindromic rheumatism
Compression arthralgia
Metatarsalgia
Dactylitis
Ankle flare
Panniculitis
Facet joint injection
Diabetic cheiroarthropathy