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Measures to protect the joint cartilage from overheating when the tumor is very close to the joint surface. (A) A tube was inserted into the space between the femoral head and acetabulum for infusion of cooled saline to protect the cartilage (Note: the negative pressure should be overcome by pulling the leg until a clear sound such as a “pop” can be heard.). (B) The temperature curve at both sides of the acetabulum cartilage.
