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1.There is a disc in between the vertebrae, which helps as shock-absorber and supports in weight bearing. The disc contains good amount of fluid %, The disk looses the hydration in degenerative changes.
2.Due to disc disease
there is a slippage / herniation of the disc posteriorly.
3.Causing chord compression at multiple levels, and nerve
compression seen al lower lumbar level.
4.As inflammatory changes ligamentum flavum hyper trophy noted.
5.Its not genetic / inheritor , its just degenerative changes.
6.Treatment in this case with simple back exercise followed by physiotherapy
- final stage if not relived - operative / intervention are done.
Hope it helps you. Wish you a good health.
Anything to ask ? do not hesitate. Thank you.