Tibial hemimelia-polysyndactyly-triphalangeal thumb syndrome

Tibial hemimelia-polysyndactyly-triphalangeal thumb syndrome (also known as Werner syndrome or tibial hemimelia with polysyndactyly and triphalangeal thumbs) is an extremely rare congenital skeletal disorder characterized by a triad of limb malformations: tibial hemimelia (partial or complete absence of the tibia, the larger bone of the lower leg), polysyndactyly (extra digits that may also be fused together), and triphalangeal thumbs (thumbs that have three phalanges instead of the normal two, causing them to appear finger-like). These abnormalities primarily affect the skeletal and musculoskeletal systems of both the upper and lower extremities. The condition is present at birth and can significantly impact mobility and hand function. Tibial hemimelia leads to shortening and instability of the affected leg, often resulting in difficulty walking and requiring orthopedic intervention. The polysyndactyly and triphalangeal thumbs can impair fine motor skills and hand grip. The severity of each component can vary among affected individuals, even within the same family. Additional features may include preaxial polydactyly of the feet. Treatment is primarily surgical and supportive. Orthopedic procedures may include limb reconstruction, prosthetic fitting, or amputation for severe tibial deficiency. Surgical correction of polysyndactyly and triphalangeal thumbs can improve hand function and appearance. Early intervention with physical and occupational therapy is important to optimize functional outcomes. Genetic counseling is recommended for affected families given the hereditary nature of the condition.

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