What you have anatomically is a failure of differentiation of the L5 vertebra which only rarely causes pain and certainly would not cause pain in the wrist, shoulder and ankle. Bertolotti’s Syndrome (which is the name for the painful condition-again rare) can cause local pain (in the side of the lower back) only. Have they ruled out a mild form of Rheumatoid Arthritis or other inflammatory disorders? Did they do blood testing including WBC, ESR and CRP?
Dr. Corenman