Patient: examination and laboratory tests: not detected did not use Western medicine, Chinese medicine treatment: no treatment did not use Western medicine, Chinese medicine history: left leg synovitis 4 months oral Chinese medicine has been relieved, the last few days bought a foot soak footbath fitness machine with 4 days, found that when working or lifting heavy objects when the buttocks above the middle of the seam of the distension of the pain and soreness, stop whacking or cat back support where to stand for a while can be relieved. What is this disease, how to check, treatment.