Congenital Hand Differences in Childhood: Integrating Genetic Diagnosis, Reconstructive Strategies, and Long-Term Functional Development

Resumen

Congenital hand malformations comprise a heterogeneous group of developmental abnormalities that may affect anatomy, function, growth, and psychosocial adaptation throughout childhood. Their management increasingly requires the integration of genetic diagnosis, phenotypic characterization, reconstructive planning, rehabilitation, and long-term functional assessment. This study analyzed the principal genetic, anatomical, surgical, developmental, and psychosocial factors involved in congenital hand differences through a structured integrative review based on the scientific method. Evidence from contemporary classifications, pediatric registries, reconstructive series, and long-term functional studies was examined, with particular attention to syndactyly, polydactyly, thumb duplication, thumb hypoplasia, radial longitudinal deficiency, and index-finger pollicization. The findings showed substantial diagnostic heterogeneity and demonstrated that greater anatomical involvement was associated with lower upper-extremity and global functional scores. However, functional limitation did not necessarily correspond to proportional emotional or social impairment. Long-term reconstructive outcomes revealed persistent reductions in grip and pinch strength after some procedures, while dexterity and practical hand use could remain comparatively preserved, highlighting the role of developmental adaptation. Revision surgery, recurrent deformity, and secondary procedures were also identified across several reconstructive strategies, emphasizing the influence of growth on long-term results. Overall, the evidence supports a multidisciplinary and longitudinal model in which therapeutic success is defined not exclusively by anatomical correction but by the interaction among structural stability, function, adaptation, independence, participation, and quality of life. Future prospective multicenter studies integrating genetic, surgical, and patient-reported outcomes are required to improve individualized decision-making in pediatric congenital hand care.