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J Pediatr Orthop. 1989 Sep-Oct;9(5):541-50.

The crankshaft phenomenon.

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St. Vincent de Paul Hospital, Paris, France.


We reviewed 40 spinal fusions done prior to Risser stage I for idiopathic and paralytic scoliosis to evaluate postoperative curve progression. The 39 patients who had posterior fusion alone had progressive angulation and rotation of the spine over the postoperative follow-up period. The more immature the patient, the greater the resultant progression. This progression is an inevitable consequence of continued anterior spinal growth in the presence of a posterior fusion, and occurs without pseudarthrosis or hardware failure. Younger patients may require anterior and posterior fusion to achieve stable correction.

[Indexed for MEDLINE]

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