A striped racer, also known as the California whipsnake, is a species of non-venomous snake native to the coast and foothills of California. It is a long, slender, and fast-moving snake, identified by its distinctive stripes running down the length of its body. They primarily feed on lizards and small rodents. The scientific name for this species is Masticophis lateralis.
Congenital knee dislocation
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The knee may be dislocated at birth.
(See also Introduction to Congenital Craniofacial and Musculoskeletal Disorders.)
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), clubfoot, and characteristic facies (eg, prominent forehead, depressed nasal bridge, wide-spaced eyes), or with arthrogryposis. The dislocation may be related to muscle imbalance (if myelodysplasia or arthrogryposis is present) or intrauterine positioning. Ipsilateral hip dislocation often coexists.
On examination the leg is extended and cannot be flexed more than a few degrees.
If the infant is otherwise normal, immediate treatment with daily passive flexion movements and splinting in flexion usually results in a functional knee.
Congenital knee dislocation meaning & definition 1 of Congenital knee dislocation.