2008三医大 WJ Chen Joints of the lower limb Pubic symphysis Sacroiliac Joint A Joints of pelvic girdle sacroiliac joint, pubic 寒 symphysis, lig( pelvis Hip joint Joints of free bones hip joint, knee joint Knee joint joints of foot ankle on Ankle joint2008三医大 WJ Chen 13 Joints of pelvic girdle： sacroiliac joint，pubic symphysis，lig.（pelvis） Joints of free bones：hip joint，knee joint， joints of foot（ankle joint） Pubic symphysis Sacroiliac joint Hip joint Knee joint Ankle joint Joints of the lower limb