Fibular aplasia-complex brachydactyly syndrome

Fibular aplasia-complex brachydactyly syndrome (also known as Du Pan syndrome or fibular hypoplasia and complex brachydactyly) is an extremely rare genetic skeletal disorder characterized by the absence or severe underdevelopment (aplasia or hypoplasia) of the fibula (the smaller bone of the lower leg) combined with complex brachydactyly (shortening of the fingers and toes). The condition primarily affects the skeletal system, particularly the limbs. Key clinical features include absent or markedly shortened fibulae bilaterally, short stature, and distinctive hand and foot malformations. The brachydactyly is described as "complex" because it involves shortening, absence, or fusion of multiple bones in the fingers and toes (phalanges and metacarpals/metatarsals), sometimes with a ball-and-socket appearance of certain finger joints. Tarsal coalition (fusion of bones in the feet) is also commonly observed. Du Pan syndrome has been linked to mutations in the GDF5 gene (growth/differentiation factor 5), which plays a critical role in bone and joint development. This gene is also implicated in other skeletal dysplasias, including acromesomelic dysplasia (Grebe type and Hunter-Thompson type), which are considered related but more severe conditions. The syndrome follows an autosomal recessive inheritance pattern, meaning that an affected individual must inherit a pathogenic variant from each parent. There is currently no cure or disease-specific treatment for fibular aplasia-complex brachydactyly syndrome. Management is supportive and symptomatic, focusing on orthopedic interventions to address limb length discrepancies, gait abnormalities, and functional limitations. This may include physical therapy, orthotic devices, and in some cases surgical procedures to improve mobility and function. Genetic counseling is recommended for affected families to discuss recurrence risks and family planning options.

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