Index finger pollicization for congenital aplasia or hypoplasia of the thumb.

Sensation, strength, dexterity, length, and range of motion were evaluated after index finger pollicization in 10 patients (14 hands). Diagnoses included congenital absence of the thumb (10 hands) and hypoplasia (4 hands). Average age at operation was 7 years, and follow-up averaged 9 years. Patients with unilateral pollicization averaged 67% grip strength, 60% lateral pinch, 56% palmar pinch, and 39% three-point pinch as compared with the normal contralateral hand. Manual dexterity averaged 70% efficiency as compared with normal standards defined according to age and sex. However, 55% of the patients, when stressed, used side-to-side pinch. It was noted that in those patients who used side-to-side pinch performance averaged 54% of normal standards, compared with 93% in patients who used tip-to-tip pinch for prehension.