Bifurcated femur with a normal tibia and fibula

Area of Science:

• Orthopedics
• Human Anatomy
• Medical Genetics

Background:

• Congenital anomalies of the lower limb present a spectrum of developmental abnormalities.
• Bifurcation of the distal femur is an exceedingly rare condition, with limited documented cases.
• Previous reports predominantly link bifurcated femurs to tibial hemimelia.

Observation:

• A unique case of distal femur bifurcation was identified.
• The anomaly was observed in conjunction with a fully developed and normally structured tibia, fibula, ankle, and foot.
• This presentation deviates significantly from previously described instances.

Findings:

• This case represents the first documented instance of a bifurcated femur occurring without associated tibial hemimelia or other lower limb malformations.
• The unaffected development of the distal tibia, fibula, ankle, and foot highlights a potentially distinct etiology or developmental pathway for this specific femur anomaly.
• Detailed anatomical description and imaging confirmed the isolated nature of the femur bifurcation.

Implications:

• This finding expands the known phenotypic spectrum of distal femur bifurcation.
• It suggests that the developmental processes leading to femur bifurcation may be independent of those causing tibial hemimelia.
• Further research into the genetic and developmental factors underlying this isolated anomaly is warranted to improve understanding and potential interventions.