A patient with a femoral neck fracture is scheduled for hemiarthroplasty. Why is this surgical approach recommended over other methods?

Hemiarthroplasty is specifically indicated for femoral neck fractures where the acetabulum remains healthy and intact. This procedure involves replacing the femoral head and neck while leaving the natural hip socket alone. By replacing only the damaged femoral component, surgeons minimize the complexity of the operation and preserve the patient's existing bone structure in the pelvis. It is a common choice for elderly patients with displaced fractures who require early mobilization to avoid complications. Choice B rationale Joint disease affecting the entire hip joint, such as advanced osteoarthritis or rheumatoid arthritis, typically requires a total hip arthroplasty rather than a hemiarthroplasty. A hemiarthroplasty only addresses one side of the joint, so it would fail to alleviate pain originating from a diseased or eroded acetabulum. Therefore, this approach is not recommended when the whole joint is compromised. Total replacement ensures that both articulating surfaces are smooth and functional to reduce chronic pain. Choice C rationale Fusing the bones of a fractured joint is a procedure known as arthrodesis, which is entirely different from a hemiarthroplasty. Arthrodesis results in a complete loss of joint mobility to provide stability and pain relief, whereas hemiarthroplasty aims to restore movement by providing a prosthetic articular surface. In the context of a femoral neck fracture, maintaining mobility is usually the primary goal to ensure the patient can walk and perform daily activities after surgery. Choice D rationale Replacing both the hip socket and the femoral head describes a total hip arthroplasty, not a hemiarthroplasty. While a total hip replacement provides a more durable solution for active patients or those with existing arthritis, hemiarthroplasty is preferred for those with isolated femoral neck damage. Performing a full replacement when only the femur is fractured would involve unnecessary removal of healthy pelvic bone and increase the risk of surgical complications and longer operative times.