Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Knee Replacement ?
    ### Response:
    There are many different types and designs of artificial knees. Most consist of three components: -  the femoral component, which is the part that attaches to the thigh bone  - the tibial component, the part that attaches to the shin bone   - the patellar component, the knee cap.
    