Congenital flexion deformities of the proximal interphalangeal joint in children: a subgroup of camptodactyly.
Koman LA, Toby EB, Poehling GG. Congenital flexion deformities of the proximal interphalangeal joint in children: a subgroup of camptodactyly. J Hand Surg Am. 1990 Jul; 15(4):582-6.