Hemiprostheses

A hemiprosthesis is a partial joint replacement. Unlike a total joint replacement, which replaces all the worn or damaged parts of a joint, a hemiprosthesis only replaces one side of the joint. This type of implant is commonly used in hip and shoulder replacement surgeries.

In hip replacement surgery, a hemiprosthesis is typically used to replace the femoral head, which is the ball-shaped part of the hip joint. The acetabulum, which is the socket part, is usually left intact. This procedure is often performed for patients with a fractured femoral neck where the acetabulum is healthy. Similarly, in shoulder replacement surgery, a hemiprosthesis may replace the humeral head, the ball of the shoulder joint, while the glenoid, the socket, remains.

The decision to use a hemiprosthesis versus a total joint replacement depends on several factors, including the patient's age, activity level, the condition of the surrounding bone and cartilage, and the specific nature of the joint damage. Hemiprosthetic surgery can sometimes be a less extensive procedure than a total joint replacement, potentially leading to a shorter recovery time. However, the longevity and functional outcomes can vary compared to total joint replacements. As with any surgical procedure, there are potential risks and benefits associated with hemiprosthesis implantation.