Hip prosthesis zones

Zones used to describe the positioning of hip prostheses

Overview

Hip prosthesis zones by DeLee and Charnley system, and Gruen system

The concept of hip prosthesis zones is crucial in the field of orthopedic surgery, particularly in the evaluation and management of total hip arthroplasty (THA). These zones are used to describe specific areas around the hip prosthesis, which are important for assessing the positioning, fixation, and potential complications associated with the implant.

DeLee and Charnley Zones

The DeLee and Charnley system is used to describe the acetabular component of the hip prosthesis. It divides the acetabulum into three zones:

• Zone I: The area adjacent to the iliac bone.
• Zone II: The central part of the acetabulum.
• Zone III: The area adjacent to the ischium.

These zones are used to evaluate the position and fixation of the acetabular cup, as well as to identify potential areas of osteolysis or loosening.

Gruen Zones

The Gruen system is used to describe the femoral component of the hip prosthesis. It divides the femur into seven zones:

• Zone 1: The proximal lateral aspect of the femur.
• Zone 2: The proximal medial aspect of the femur.
• Zone 3: The middle lateral aspect of the femur.
• Zone 4: The middle medial aspect of the femur.
• Zone 5: The distal lateral aspect of the femur.
• Zone 6: The distal medial aspect of the femur.
• Zone 7: The tip of the femoral stem.

These zones are critical for assessing the fixation and stability of the femoral stem, as well as for identifying potential complications such as periprosthetic fractures or stress shielding.

Importance in Clinical Practice

Understanding hip prosthesis zones is essential for radiologists, orthopedic surgeons, and other healthcare professionals involved in the care of patients with hip replacements. Accurate assessment of these zones can help in diagnosing complications, planning revision surgery, and improving patient outcomes.

Related Pages

• Total hip arthroplasty
• Osteolysis
• Periprosthetic fracture
• Orthopedic surgery