Outcome and complications of constrained acetabular components

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Recurrent hip instability poses a significant challenge in orthopedic surgery.
• Constrained acetabular liners offer a potential solution by enhancing joint stability.

Purpose of the Study:

• To review the designs, indications, outcomes, and complications of constrained acetabular liners.
• To evaluate the efficacy and safety of these devices for treating hip instability.

Main Methods:

• Review of existing literature on constrained acetabular component designs.
• Analysis of reported outcomes and complication data.
• Categorization of complications based on their relationship to the device's constraining mechanism.

Main Results:

• Constrained liners vary in design, accommodating different femoral head sizes and allowing limited motion.
• Complications include dislocation, dissociation, impingement, aseptic loosening, osteolysis, and periprosthetic fractures.
• While effective for stability, risks associated with the constraining features are notable.

Conclusions:

• Constrained acetabular liners are effective in managing severe hip instability.
• The potential for device-related complications warrants careful consideration.
• These components are best reserved as a salvage option for complex instability cases.