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Surgical procedures. a Surgical procedures drawing: 1 Femoral head, 2 The freezing section of bone tunnel, 3 The protective section of bone tunnel, 4 The inserting side of aspirator, 5 The inserting side of cryogenic probe, 6 Femoral neck, 7 Femoral greater trochanter. b The greater trochanter. c The wan femoral head and femoral neck after being frozen
