Hip hemiarthroplasty or partial hip replacement is a surgery in which only the ball portion of the hip joint is replaced. Hip arthroplasty is mostly reserved for patients with hip fracture, especially those with low functional demands.
Below are before (left) and after (right) X-rays of an eighty-year-old woman who fractured her left hip from a fall on ice. She underwent a left hip hemiarthroplasty using press-fit (cementless) stem with a large metallic ball mounted on top of it. The patient was able to bear weight right away after surgery.