Isolated acheiropodia

Isolated acheiropodia (also known as acheiropody, Horn-Kolb syndrome, or bilateral congenital amputation of the hands and feet) is an extremely rare autosomal recessive congenital limb malformation characterized by the complete absence of the hands and feet (bilateral aplasia of the distal portions of the upper and lower extremities). The condition presents at birth with bilateral transverse hemimelia, meaning the forearms terminate at or near the wrist level and the legs terminate at or near the ankle level, with the absence of all digits. The remaining proximal portions of the limbs are typically well-formed, and affected individuals generally do not have other associated malformations — hence the term 'isolated.' Intelligence and other organ systems are normal. The condition was first described in families from Brazil, particularly among consanguineous families of European descent. The genetic basis of acheiropodia has been mapped to chromosome 7q36, involving a homozygous deletion in the LMBR1 gene region, which encompasses the ZRS (zone of polarizing activity regulatory sequence), a critical long-range enhancer of the SHH (Sonic Hedgehog) gene essential for limb development. This deletion disrupts normal limb patterning during embryonic development. There is no curative treatment for acheiropodia. Management is supportive and focuses on rehabilitation, including the use of prosthetic devices for both upper and lower limbs to improve mobility and functional independence. Multidisciplinary care involving orthopedic specialists, prosthetists, physical therapists, and occupational therapists is essential. With appropriate prosthetic fitting and rehabilitation, affected individuals can achieve significant functional capacity and lead independent lives. Genetic counseling is recommended for affected families, particularly in communities where consanguinity is common.

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