What is the hallmark deformity of Blount disease?

What is the hallmark deformity of Blount disease?

• A. Bowing of tibia
• B. Bowing of femur
• C. Scoliosis
• D. Angular deformity of the radius

Answer: (A)

Blount disease is defined by abnormal growth at the proximal tibial physis, which produces angular deformity of the leg. The hallmark deformity is bowing of the tibia—specifically a varus, inward bowing of the proximal tibia (tibia vara). This localized tibial bowing beneath the knee is classic for this condition and helps distinguish it from deformities of other bones or the spine. In contrast, deformities of the femur, scoliosis, or angular deformities of the radius are not characteristic hallmarks of Blount disease.

Blount disease is defined by abnormal growth at the proximal tibial physis, which produces angular deformity of the leg. The hallmark deformity is bowing of the tibia—specifically a varus, inward bowing of the proximal tibia (tibia vara). This localized tibial bowing beneath the knee is classic for this condition and helps distinguish it from deformities of other bones or the spine. In contrast, deformities of the femur, scoliosis, or angular deformities of the radius are not characteristic hallmarks of Blount disease.