Novel, Patient-Specific Instruments for Acetabular Preparation and Cup Placement

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Patient-specific instrumentation (PSI) offers potential benefits in joint replacements, including improved accuracy and efficiency.
• In total hip arthroplasty (THA), PSI aims to enhance surgical precision, implant longevity, and patient outcomes.
• A novel PSI system was developed to improve acetabular bone resection and cup placement in THA.

Purpose of the Study:

• To evaluate the efficacy of a novel patient-specific instrumentation (PSI) system for total hip arthroplasty (THA).
• To assess the accuracy of acetabular bone resection and component placement using the Bullseye Hip Replacement Instruments®.

Main Methods:

• A cadaveric study involving 14 acetabuli was conducted.
• Pre-operative CT/MRI scans informed the use of Bullseye Hip Replacement Instruments®.
• Two experienced hip surgeons performed THA using the PSI technique, with post-operative CT scans for analysis.

Main Results:

• The Bullseye Hip Replacement Instruments® were used to implant 14 acetabuli.
• Post-operative CT analysis revealed an average acetabular cup anteversion of 15.50°.
• Average acetabular cup abduction/inclination was 35.9°, with accurate component sizing matching pre-operative plans.

Conclusions:

• The Bullseye Hip Replacement Instruments® provide reproducible acetabular component placement in terms of anteversion and abduction.
• This PSI system demonstrates accurate sizing of the acetabular component in THA.
• The findings suggest potential for improved surgical accuracy in total hip arthroplasty using this novel instrumentation.