The crankshaft phenomenon results when a scoliotic deformity previously treated by posterior arthrodesis demonstrates progressive increase in curve magnitude and rotational deformity. The cause is thought to be anterior growth tethered by the posterior fusion. This phenomenon, documented in idiopathic scoliosis, has been reported in children with congenital scoliosis treated by posterior fusion alone before age 10 years. It has not been reported when anterior and posterior arthrodesis were performed together in this population.
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