Electrical Impedance Myography of Neck and Low Back Pain

1. Radiculopathy Subjects: Inclusion Criteria: * Age 21-80 years old * History consistent with radiculopathy based on clinical, radiologic, and standard electrophysiological criteria, as determined by spine expert (Dr. John Keel) Exclusion Criteria: * Age under 21 or over 80 * History of a generalized neuromuscular condition, except for mild polyneuropathy or common mononeuropathies (e.g., carpal tunnel syndrome, ulnar neuropathy at the elbow) * History of moderate-to-severe ongoing medical conditions producing generalized disability, such as advanced cardiac or renal disease * Metal spine implants of any type 2. Musculoskeletal Back Pain Subjects: Inclusion Criteria: * Age 21 to 80 years old * Low back or neck pain without evidence to suggest neuropathic component; i.e., without radiation of pain, sensory loss or weakness Exclusion Criteria: * Age under 21 or over 80 * History of sciatica or cervical radiculopathy * History of a generalized neuromuscular condition, except for mild polyneuropathy or common mononeuropathies (e.g., carpal tunnel syndrome, ulnar neuropathy at the elbow) * History of moderate-to-severe ongoing medical conditions producing generalized disability, such as advanced cardiac or renal disease * Metal spine implants of any type 3. Undiagnosed Lower Back or Neck Pain Subjects: Inclusion Criteria: * Age 21 to 80 years old * Major complaint of lower back or neck pain Exclusion Criteria: * Age under 21 or over 80 * Recent (\<6 month) history of similar symptoms that has been evaluated * History of a generalized neuromuscular condition, except for mild polyneuropathy or common mononeuropathies (e.g., carpal tunnel syndrome, ulnar neuropathy at the elbow) * History of moderate-to-severe ongoing medical conditions producing generalized disability, such as advanced cardiac or renal disease * Metal spine implants of any type