What is the difference between total hip replacement and hemi-hip replacement?

The main differences between total hip replacement and hemiarthroplasty (partial hip replacement) lie in the surgical techniques, indications, precautions, and other aspects. A detailed analysis is as follows:

1. Different Surgical Techniques

Total hip replacement is a complete hip joint replacement procedure. It involves removing the damaged portions of the hip joint and replacing them with an artificial joint. Hemiarthroplasty, on the other hand, is a partial hip replacement surgery in which only part of the hip joint—typically the femoral head—is replaced, and it is suitable for cases where only the femoral head is affected by disease or fracture.

2. Different Indications

Total hip replacement is primarily indicated for patients with femoral head necrosis accompanied by severe acetabular inflammation and erosion, significant wear of acetabular cartilage, acetabular dysplasia, or those under 70 years of age. Hemiarthroplasty is more suitable for patients with isolated femoral head necrosis but healthy acetabular structures, particularly those over 70 years old.

3. Different Precautions

Total hip replacement involves greater surgical trauma, longer operation time, increased blood loss, and a higher risk of postoperative complications. In contrast, hemiarthroplasty is less invasive, has a shorter operative duration, less blood loss, and fewer postoperative complications.

Besides the above differences, total and partial hip replacements also differ in surgical cost and long-term outcomes. The choice of procedure is made by the physician based on the patient’s specific clinical condition.