Trabecular Metal cups for acetabular defects with 50% or less host bone contact

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering

Background:

• Traditional treatments for acetabular revision with large contained bone defects (<50% host bone contact) include roof reinforcement or antiprotrusio cages.
• Trabecular Metal cups present a potential alternative for these challenging cases.

Purpose of the Study:

• To evaluate the clinical and radiographic outcomes of using Trabecular Metal cups for acetabular component revision in hip arthroplasty with significant bone defects.

Main Methods:

• Prospective follow-up of 53 hip revision acetabular arthroplasty procedures using Trabecular Metal cups for defects with ≤50% host bone contact.
• Clinical and radiographic assessments for loosening or failure, with a minimum follow-up of 24 months (average 45 months).

Main Results:

• Average host bone contact was 19% (range 0-50%).
• Mean improvement in Merle d'Aubigne-Postel score was 5.2 points.
• Failure rate was 4% (two cups revised), with an additional 4% showing probable loosening.

Conclusions:

• Trabecular Metal cups without additional structural support are a reasonable treatment for acetabular cavitary defects with <50% host bone contact.
• This approach demonstrates acceptable clinical and radiographic results in revision hip arthroplasty.