If you are looking forward to having a non-surgical pain management treatment for your spinal disorder, a lumbar epidural steroid injection might be the perfect solution. What Condition Does a Lumbar Epidural Steroid Injection Treat? A lumbar epidural steroid injection is used for a variety of lower back pain and spinal conditions. These include: 1. Inflamed or pinched nerves. 2. Lumbar herniated discs. 3. Sciatica 4. Lumbar spinal stenosis.