disc at L45 can cause numbness in the leg but not in the arm. This is due to compression of the nerve supplying your leg, due to the herniated disc.
You may have a similar problem in the neck (cervical spine).MRI of the cervical spine well confirm this.
Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.