Rotationplasty

**Semantic type:** Therapeutic or Preventive Procedure

**Definition:** A surgical procedure used to treat malignant bone tumors near the knee in which the bottom of the femur and the upper tibia are surgically removed and the lower leg is rotated 180 degrees and re-attached to the femur. The foot and ankle then function as a substitute knee joint allowing for comparable stability to a below-the-knee amputation when placed in a prosthetic.