Brief Answer:
arthritis and disc degeneration
Detailed Answer:
Hi, thanks for using healthcare magic
The vertebra are different aspects, the facet joints (that are mentioned in relation to the L3 and L4 vertebra) are the parts where two vertebra meet or interface with one another.
Like all the other joints in the body, the facet joints consist of bone,
cartilage, synovial tissue. They play an important part in resisting
stress to the vertebra.
In your L3 and L4 vertebra there is slight facet arthopathy , this means that there is irregularity at the facet joints (where L3 and L4 are meeting). This usually implies that there are arthritis like changes to the facet joints.
Between the vertebra are intervertebral discs. These discs are made up of two main parts; the outer ring is called the
annulus fibrosus and the inner part is called the
nucleus pulposus.
These intervertebral disc act as shock absorbers, it is made up of a gel like substance. AS aging occurs these discs start to degenerate or break down, they lose some of the fluid in the gel and become disorganised and weaker.60% of persons over 40 have some degeneration of the disc.
Because the disc is weaker and not as gel like then the disc space decreases , this is why there is narrowing between L4 and L5 because the disc is degenerated.
The result also states that there is no problem between L5 and S1 and that the
spinal cord itself is not being compressed by the vertebra.
Summary- arthritis at the facet joints L3 and L4
degeneration of the disc between L 4 and L5 causing narrowing of the disc space
This is mainly treated by pain medication and
physiotherapy.
I hope this helps, feel free to ask any thing else