Tresona Instrument AB

Introduction

The Aaro Anterior Spine System is recommended for correction, fixation and fusion in patients with juvenile and adolescent idiopathic scoliosis.

The implants consists of T-shaped segmental plates with a rod. Two cancellous screws are used to fixate each plate to the vertebral body. A setscrew fixates the rod.

All components are made of titanium alloy (Ti6Al4V).

Concept

The idea with the Aaro Anterior Spine system is to use a bandwhich is flexible in the scoliotic plane but rigid in the sagittal plane to reduce the risk for kyphosis in thoraco lumbar andlumbar curves.

The implants are applied on the convex side of the deformity.Correction of the curve is made by compression. This means that the load goes through the spine and not through the implants.

As the correction is through compression the rod functions as a tension band which means that the dimensions of the construction can be reduced.

The reduced height of the implants means that they can be completely covered by the pleura in thoracic instrumentation.

Previously one argument against anterior surgery was the proposed increased risk for decrease in respiratory function. However later studies has shown that the risk was overestimated and that respiratory impairment is restored within 6 months.

Correction of the rotation is achieved since a band automatically tries to get the apical vertebrae in the same transversal rotation as the end vertebrae.

With the t-shaped segmental plates where the instrumentation is made level after level long instrumentations can be made.

© 2004 Tresona Instrument AB

The Aaro Anterior Spine System G3