The use of modularity in revision total hip replacement

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Materials Science in Implants

Background:

• Total hip revision surgery addresses complications and failures in primary hip arthroplasty.
• Understanding component revision patterns is crucial for optimizing surgical techniques and implant design.
• The modularity of hip implants allows for intraoperative adjustments, potentially simplifying revision procedures.

Purpose of the Study:

• To determine the common patterns of component revision in total hip arthroplasty.
• To assess the frequency of utilizing modular features of retained components during revision surgery.
• To evaluate the clinical value of modularity in hip revision procedures.

Main Methods:

• Retrospective review of 158 total hip revision cases performed between 1991 and 1995.
• Exclusion of revisions involving surface replacement, endoprosthesis, bipolar stem, or infection.
• Analysis of retained femoral stems and acetabular sockets to determine if modular heads or liners were exchanged.

Main Results:

• The most frequent revision pattern was replacing all components (48.7%).
• Retaining the femoral stem and revising the acetabular socket occurred in 33.5% of cases.
• When femoral stems were retained, modular heads were exchanged in 88% of cases; when sockets were retained, liners were exchanged in 50% of cases.
• Modular features of retained components were utilized in 41.8% of all revision cases.

Conclusions:

• Revision of all components is the most common strategy in total hip revision.
• Modularity of retained femoral stems and acetabular sockets is frequently leveraged during revision surgery.
• The modular nature of hip implant components proves valuable in a significant portion of revision procedures.