BIOMECHANICAL EFFECT OF MACROSCOPIC DEGENERATION IN A LUMBAR INTERVERTEBRAL DISC

摘要

Structural alterations of the disc arc accompanied by changes in disc tissue structure and composition during degeneration processes. Fissures and cracks appear in the disc some times extending from the outer annulus to the nucleus. Animal studies have shown that when a rim lesion was introduced in the annulus. progressive failure on the inner annulus was observed (1). From a macroscopic study on lumbar motion segments originating from regular autopsies it was shown (2) that nuclear clefts precede annular tears. Within the annular tears, rim lesions follow the radial and concentric tears.