What type of tests are available to test for problems with sciatica nerve?

See an osteopathic : physician for consult, treatment & management. Your previous history of having foot surgery & physical therapy once you being seen by a osteopathic physician, who is a DO physician, specializing in musculoskeletal medicine (NMM). Your sciatica may be a direct result from your foot surgery & this needs to be evaluated further and treated. That will provide you immediate relief and management.

Nerve not the prob: ? re "sciatica": name of pain pattern evoked by impingement of sciatic nerve tract: at vertebral foramen, or at sacroiliac joint, or at pyriformis muscle or by tumor. If nerve injured to point of cell death (most w/o death) use nerve conduction tests to diagnose. Diagnostic info includes Fortin, Short Leg, Gillette & Pyriforms Signs, pelvic girdle counternutation, and MRI imaging. See Osteopath.