What finding would best differentiate a child with genu varum due to hypoplastic medial tibial plateau as having chondroectodermal dysplasia as opposed to Blount disease?

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Chondroectodermal dysplasia, also known as Ellis-van Creveld syndrome, is characterized by a combination of skeletal dysplasia, polydactyly (such as hexadactyly), congenital heart defects, and ectodermal dysplasia. Hexadactyly is a distinctive feature that differentiates it from Blount disease, which is a growth disorder of the tibia that causes the lower leg to angle inward, resembling a bowleg.

What Finding Would Best Differentiate a Child with Genu Varum