pediatrics
Congenital Knee Dislocation
Introduction
The knee may be dislocated at birth. (See also Introduction to Congenital Craniofacial and Musculoskeletal Abnormalities .) Anterior knee dislocation with hyperextension is rare at birth but requires emergency treatment. It may occur with Larsen syndrome, which consists of multiple congenital dislocations (eg, elbows, hips, knees), Talipes Equinovarus (Clubfoot) and Other Foot Abnormalities , and characteristic facies (eg, prominent forehead, depressed nasal bridge, wide-spaced eyes), or with On examination the leg is extended and cannot be flexed more than a few degrees. Imaging tests, including x-rays, MRI, or CT of the affected area, are often done. If the infant is otherwise normal, immediate treatment with daily passive flexion movements and splinting in flexion usually results in a functional knee. 