The Effect of Axial Torsion on the Mechanical Properties of the Annulus Fibrosus.

Study Design: In-vitro study of the tissue mechanics of annulus fibrosus.

Objective: To determine the effect of axial torsion on the mechanical properties of the inter- and intralamellar matrices.

Summary Of Background Data: Axial torsion, when combined with repetitive flexion, has been associated with an increased risk of intervertebral disc herniation.

Pressure-induced end-plate fracture in the porcine spine: Is the annulus fibrosus susceptible to damage?

Purpose: To determine if the mechanical properties of the annulus fibrosus (AF) are altered following end-plate fracture. Vertebral fractures, particularly those in the growth plate, are relatively common among adolescents. What is unclear is whether or not these fractures are also associated with concomitant damage to the intervertebral disc (IVD), in particular the AF.