Progressive pseudorheumatoid arthropathy of childhood (Q88362)

Progressive pseudorheumatoid arthropathy (dysplasia) of childhood (PPAC; PPD) presents as spondyloepiphyseal dysplasia (SED) tarda with progressive arthropathy and is described as a specific autosomal recessive subtype of SED. Typically, there are no symptoms in the newborn period. The most common signs at diagnosis are bowing of the legs, muscle weakness, symmetric swelling of the proximal interphalangeal joints. Motion range limitation, deformities and pain develop gradually, and spread to other joints. Many patients have spinal involvement manifesting as exaggerated lumbar lordosis, thoracic kyphosis, and/or scoliosis.