INTRODUCTION DISC DEGENERATION IS AN IMPORTANT FACTOR IN VERTEBRA SHIFTING PROGRESSIVITY FOR EXAMPLE DEGENERATIVE SPONDYLOLISTHESIS WHICH IS THE CAUSE OF LOW BACK PAIN AND LUMBAL INSTABILLITY ANATOMICALLY THERE ARE SOME RISK FACTORS FOR DEGENERATIVE SPONDYLOLISTHESIS SUCH AS SAGITTAL ORIENTATION OF THE FACET JOINT LUMBAL LORDOTIC ABNORMALITY IN LUMBAL INDEX LOW DISC HEIGHT AND SHORT SPINOUS PROCESS
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