Which deformity refers to inward curvature of the little finger and is associated with Down syndrome?

Which deformity refers to inward curvature of the little finger and is associated with Down syndrome?

• A. Clinodactyly
• B. Syndactyly
• C. Polydactyly
• D. Camptodactyly

Answer: (A)

Inward curvature of the little finger is clinodactyly. This congenital angulation occurs when the middle phalanx has an abnormal shape (often a delta phalanx), causing the finger to bend toward the adjacent finger, commonly the little finger curving medially. Clinodactyly is a feature frequently seen in Down syndrome, though it can appear in other conditions as well. Syndactyly would mean digits are fused together, not simply curved. Polydactyly refers to extra digits. Camptodactyly is a fixed flexion deformity at the proximal interphalangeal joint, causing the finger to stay bent rather than simply curved inward.

Inward curvature of the little finger is clinodactyly. This congenital angulation occurs when the middle phalanx has an abnormal shape (often a delta phalanx), causing the finger to bend toward the adjacent finger, commonly the little finger curving medially. Clinodactyly is a feature frequently seen in Down syndrome, though it can appear in other conditions as well.

Syndactyly would mean digits are fused together, not simply curved. Polydactyly refers to extra digits. Camptodactyly is a fixed flexion deformity at the proximal interphalangeal joint, causing the finger to stay bent rather than simply curved inward.