Dr. RJ Crandall, a native of Sioux Falls, SD is a 1991 graduate of the University of Sioux Falls and a 1997 graduate of Palmer College of Chiropractic in Davenport, IA. He is a specialist in the Gonstead technique of chiropractic, in which he has accrued over 300 hours of post graduate training in the technique. Dr. Crandall is a skilled adjuster and is adept at working with all age groups and backgrounds. If your lower back has bothered you, you are not alone. Eight out of ten adults will experience low back problems at some time in their lives. Most symptoms of low back pain are blamed on poor muscle tone in the back, muscle tension, spasms, ligament or muscle tears, and joint problems.