Uncemented acetabular components for arthritis after acetabular fracture

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Arthroplasty Research

Background:

• Posttraumatic arthritis following acetabular fractures presents a significant challenge for long-term joint function.
• Total hip arthroplasty (THA) is a common treatment, with evolving component designs aiming for improved outcomes.
• Uncemented acetabular components offer potential advantages but require long-term evaluation, especially in complex cases.

Purpose of the Study:

• To assess the long-term (≥10 years) clinical and radiographic outcomes of uncemented acetabular components in patients treated for posttraumatic arthritis after acetabular fracture.
• To identify the failure modes and revision rates associated with these implants in a challenging patient cohort.
• To evaluate the survivorship and functional results of uncemented acetabular fixation in this specific indication.

Main Methods:

• Retrospective review of 34 hips in 33 patients undergoing THA with uncemented porous-coated titanium acetabular components between 1984 and 1990.
• Minimum follow-up of 10 years, with assessment of implant survival, revision rates, radiographic findings (loosening, osteolysis), and clinical pain levels.
• Analysis of reasons for revision, including component loosening, polyethylene wear, dislocation, and osteolysis.

Main Results:

• At final follow-up (10-16 years), patients with unrevised components reported minimal pain, and no components showed radiographic loosening.
• Nine patients (26.5%) required acetabular revision: four revised shells and liners (loosening, dislocation, osteolysis) and five revised liners alone (polyethylene wear, dislocation).
• Uncemented acetabular sockets demonstrated a low rate of loosening in this high-demand population, but polyethylene wear and osteolysis were significant concerns.

Conclusions:

• Uncemented acetabular components can achieve durable fixation with low loosening rates in the long term for posttraumatic arthritis after acetabular fracture.
• Polyethylene wear and osteolysis represent key challenges that may necessitate revision surgery, impacting overall implant longevity.
• Careful patient selection and modern bearing surface technology may be crucial to mitigate wear-related complications in these complex arthroplasty cases.