Glucocorticoids reduce bone formation and increase bone loss via a variety of mechanisms. This effect has been shown to be dose-dependent. Doses as low as 10mg of Prednisone, has been shown to lower bone density over periods as short as 20 weeks, an effect which may be prevented with use of Calcium and Vitamin D. Inhaled Tramcinilone has also been shown to lead to dose-related loss of bone at the hip in premenopausal women. Clinic visits will be arranged for recruited patients at baseline and then at 3 and 6 months after the ESI and at any time for new-onset or severe back pain. During the initial visit, consent will be obtained, patient will be given details on the study design and rationale, severity and characteristics of back pain. Epidural corticosteroid injection (ESI) has been shown to decrease pain, speed return of function, and improve neurological signs in patients presenting with low back pain.