The Dynesys Lumbar Spinal Stabilization System A Preliminary Report on Positional Magnetic Resonance Imaging Findings

Study Design.We present the positional magnetic res-onance imaging findings of a prospective case series of patients undergoing surgery with the Dynesys spinal sta-bilization device (Zimmer, Inc., Warsaw, IN). Objective. To explore the biomechanical impact of the Dynesys device in vivo. Summary of Background Data. Spinal fusion surgery is widely used for painful degenerative conditions of the lumbar spine that have not responded to conservative measures. It often produces good outcomes but can be associated with adjacent segment hypermobility that may lead to further degeneration and pain. Previous cadaveric biomechanical studies claim that the Dynesys Dynamic Spinal Stabilization System allows some lumbar move-ment, behaving similar to a normal spine in extension bu