Does a doctor put any restriction based on this lumbar-spine X-ray ?

[edi256]

Exam is from one year ago when I was injured.
"Satisfactory lumbar alignment and lordosis. Diffuse osteopenia occurs wihtout compression fracture or listhesis. Mild disc space narrowing at L. 1/2, and more moderate posteriorly at L5/S1. Facet joint arthropathy is progressive from L3. Normal paraspinal soft tissues, sacroiliac joints, sacrum and coccyx.
Impression: No acute or aggressive osseous lesion is evident. Focal degeneration is accentuated at the lower lumbar spine."
I am 53 M, 173 cm, 73 kg, Caucasian, no smoking, no drugs, occasional drinking, live in Canada. I do not take any medication, not diagnosed with any disease. I'm performing physical work, I would say moderate, some lifting, but not fast peace. I can keep straight back position with little bending for most of the day. I do not have problems with current job tasks, only discomfort while bending, but I am fine if it is only for short duration.
However, last year, some tasks that involved bending, pushing at shoulder level, occasional lifting heavy objects, squatting, caused me burning sensation in the back part of the left leg, also numbness and weakness in legs. Symptoms worsen gradually until I had to stop completely, because even light duties became difficult to perform. Things came to normal when these tasks were removed, but it took a couple of months to get rid of the symptoms. I was recommended physiotherapy, but it took long time to be approved by the WCB and was able to take it 4 months later when almost no longer need it. Physiotherapist recommended to maintain proper body position while lifting or pushing.
Please help, because I do not know what to ask to my doctor. I was only given some temporary restrictions last year when injured. Employer is pushing to take again some duties that caused discomfort due to poor body posture last year, and I fear that I end up in the same situation unable to do any work.