a surgical procedure which replaces one half of the joint with an artificial surface and leaves the other part in its natural (pre-operative) state. This class of procedure is most commonly performed on the hip after a subcapital (just below the head) fracture the neck of the femur. The procedure is performed by removing the head of the femur and replacing it with a metal or composite prosthesis. The most commonly used prosthesis designs are the Austin Moore prosthesis and the Thompson Prosthesis.
Orthropod. 2002. Hemiarthroplasty of the Hip. Retrieved October 12, 2009 from http://www.eorthopod.com/public/patient_education/6500/hemiarthroplasty_of_the_hip.html