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The Difference between Unixial and Polyaxial Screws used in a Scoliosis Pathology

Uniaxial screws have a distinct lordosing effect on the lumbar spine when the rod is rotated posteriorly because the screw heads continue to face directly laterally irrespective of the rod position.

When rotating the rod within Polyaxial screws, the screw heads merely flip to and from without any corrective lordosing effect on the lumbar spine (see screw head positions on the illustrations below, before and after rotation). The use of uniaxial screws is strongly recommended in this situation.

Uniaxial Screws

Uniaxial Concepts

Polyaxial Screws

Polyaxial Concepts

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