Low Back Pain: Chiropractic vs. Muscle Relaxants Posted on May 10th, 2015 by Dr. David DeFries Facebook Twitter Google+ Ready to begin feeling better? Click Here to schedule online (easiest) or reach us by phone 610-494-0412 Posted Under Chiropractic research Pain Tags low back pain pain Posted By Dr. David DeFries My name is Dr. David DeFries and I understand your pain. My family has been practicing chiropractic in Delaware County for over 75 years. Throughout that time we have helped thousands of patients to get out of pain.