I am suffering from Lumbar Spondylosis with L4-L5 and L5-S1 issues. Is surgery must?

[ethanh]

I am 29 yrs male and I weight 250lbs. I've been diagnosed through my MRI done last week for Lumbar Spondylosis and have been advised for a surgery by a Neurosurgeon. My report of MRI is pasted below and I wanted to ask-

1) Do I absolutely need a surgery? Or I have other alternatives?
2) Should I visit other Neurosurgeons or should go to orthopedic or physiotherapist?

MRI OF LUMBO SACRAL SPINE

L1-L2 level - Canal API) 18.0 mm. ----> No disc herniation. Normal discal signal intensity.
E2-L3 level - Canal APD 17.0 mm. ----> No disc herniation. Normal discal signal intensity.
L3-L4 level - Canal APD 15.0 mm. ----> No disc herniation. Normal discal signal intensity.
L4-L5 level - Canal APD 9.0 mm. ----> Disc dessication. Bulging disc. Posterocentral disc prolapse. Neuroforaminal and central canal stenosis. Cauda equina compression
L5-SI level - Canal APD 8.0 mm. ----> Disc dessication. Bulging disc. Posterior disc prolapse. Neuroforaminal and central canal stenosis. Lt SI nerve root compression.

Anterior osteophytes are seen in lumbar vertebral end plates.
Conus ends at normal level with normal conus medullaris.
Lower dorsal cord is normal in size and signal intensity.
Paraspinal muscles are normal in size and signal intensity. Facet joint and ligamentum flavum are normal.

IMPRESSION

MRI findings are suggestive of -

1. Lumbar spondylosis with degenerative disc disease.

2. L4-L5 and L5-S1 posterocentral disc prolapse causing central canal and neuroforaminal stenosis with compressive radiculopathy.

Please advice me.