Hi,
A low back pain that radiates to hip and down in leg can occur with several conditions like Prolapsed disc, SI join pain and even piriformis symdrome.
To confirm these we need to perform some clinical test at clinic and if required imaging studies like x:ray or MRI.
I would recommend you to vist a good physical therapist or an Orthopaedic surgeon and get yourself evaluated.
Best: Dr. Vivek Gaur.
Next Steps
visit a good Physiotherapist
Health Tips
No bending, prolonged standing, avoid exertion