What is hypertrophic apophyseal joints and ligamenta flava

I am sufering a lot of pain in my lowback and it goes out to my hips is like a burning and it goes throu my leg .This is the findings in my mri.Straightening of the normal curvature,Grade 1 retrolisthesis of l5 on s1.Disc desiccation and narrowing of the disc space is seen at l4-l5 and l5-s1. There is generalized mild hypertrophy of the apophyseal joints. Are l4-l5 level there is mild central and lateral canal stenosis secondary to posterior disc bulge and hypertrophic apophyseal joints, there is bilateralneural foramina stenosis. l5-s1 level shows moderate central as well as lateral canal stenosis secondary to a large and diffuse posterior disc bulge,hypertrophic apophyseal joints and ligamenta flava,there is bilateral neural foramina stenosis.Please help me understand this.