Hi, Low back pain radiating to any thigh , calf , foot may be due to radiculopathy one of which is sciatica . It occurs after long history of sitting on hard surface similar to what you have. It is always advisable to get x ray of lumbo-sacral spine in already anterioposterior and lateral view to rule out any gross bony abnormality. In case of doubt CT scan gives better picture. If neurological sign n symptoms found should be correlated with MRI results. But good thing is that majority needs conservative management with regular physiotherapy, warm compression ,analgesic ,vitamine and lifestyle modification so don t be concern until your reports in your hand n get X ray done. thanks n regards