Biomechanical Evaluation of the Aspen Lumber Interspinous Fusion Device
Author: Manoj Kumar Kodigudla
Publisher:
Published: 2011
Total Pages: 142
ISBN-13:
DOWNLOAD EBOOKDegenerative disc disease (DDD) and spondylolisthesis are the most common spinal disorders that lead to low back pain in the lumbar region. The treatment options for low back pain may range from conservative treatment to fusing the vertebrae by surgical methods. Although there are many fusion devices available to treat low back pain, interspinous fusion device (Aspen) is an alternative to other fusion devices. The device consists of two plates (wide plate, lock plate) and a set screw, and can be implanted using minimally invasive surgical procedure. The purpose of the current study was to evaluate the stability and loosening of the Aspen device under complex cyclic loading with resection of interspinous and supraspinous ligaments. An in vitro study of motion analysis and cyclic loading on six lumbar motion segments was conducted. The range of motion of Aspen implanted segments was assessed before and after cyclic loading, to evaluate the stability provided and loosening of the implant. A three dimensional, non linear and validated finite element model of L3-S1 lumbar spine was also used for additional biomechanical analysis. The in vitro study suggested that Aspen interspinous device stabilized the segments after resecting the interspinous and supraspinous ligaments. Aspen reduced motion across the segment than intact but more significantly in flexion and extension (p