Single-rod versus dual-rod anterior instrumentation for idiopathic scoliosis: a biomechanical study.

Study Design: Anterior single- and dual-rod instrumented human and ovine thoracolumbar spines, with and without structural interbody support (SIS), were biomechanically tested and compared in flexion, lateral bending, and torsion.

Objective: To determine significant differences in global stiffness of the constructs in an attempt to clarify specific indications for each in the treatment of spinal deformities.

Summary Of Background Data: Single- and dual-rod anterior systems have been used without any consensus as to indications for one versus the other.