There is a machine called a PSSD that tests nerves in the feet, to let you know if the nerve is in fact trapped. YOU SHOULD REVIEW THE FOLLOWING WEBSITE AND LOCATE A DPM IN YOUR AREA.
www.dellon.com and click under neurosensory testing, and it tells you about the test.
Neurosensory testing was conceived of by neurologists in order to provide a non-painful method to measure peripheral nerve function other than the traditional electrodiagnostic studies. Neurosensory Testing is not nerve conductions studies and is not electromyography. Most often, neurosensory testing does correlate with the patientís symptoms, can identify nerve compression problems early, can identify when nerves are regenerating, is without pain, is not expensive, and is fun.
Computer-Assisted Measurement in Diabetic Patients With and Without Foot Ulceration J of the Amer Podiatric Med Assoc.:Vol. 85, Pages 679-684, 1995. Patsy L. Tassler, B.A., A. Lee Dellon, M.D., Neil M. Scheffler, D.P.M.
Computer-assisted measurements of sensibility was done at four anatomical sites of the foot of patients with diabetes with (19) and without (40) foot ulceration. Cutaneous pressure threshold measurements on patients with diabetes were compared with measurements on 30 patients without diabetes who had nonulcerated feet. Both groups had mean one-point static and moving touch, and two-point discrimination thresholds significantly different from the general population. Computer-assisted sensibility testing demonstrated significantly higher pressure thresholds for one-point static and moving touch and two-point discrimination in the ulcerated compared with the nonulcerated foot of patients with diabetes. This measurement technique is valid for documenting diminished sensation in the foot.