Detection of simulated complications in all-polymer PEEK knee prostheses: a cadaveric imaging study using...

Area of Science:

• Biomaterials Science
• Medical Imaging
• Orthopedic Surgery

Background:

• All-polymer polyetheretherketone (PEEK) knee prostheses offer advantages over metal implants, including bone-like elasticity and no imaging artifacts.
• Systematic study of radiological characteristics and complications of PEEK knee prostheses is lacking.

Purpose of the Study:

• To describe imaging features of a novel all-polymer PEEK knee prosthesis.
• To assess the detection of simulated complications using radiography, CT, and MRI in cadaver models.

Main Methods:

• Four cadaveric lower limbs were implanted with cemented PEEK knee prostheses.
• Radiography, CT, and MRI were employed to evaluate typical postoperative findings and simulated complications (loosening, cement fracture, migration, fracture).
• A musculoskeletal radiologist assessed the visibility and diagnostic characteristics of simulated complications.

Main Results:

• PEEK prostheses were clearly visible on all modalities, enabling reliable assessment of the implant-cement-bone interface without metal artifacts.
• CT provided the most comprehensive structural overview of all simulated complications.
• T2-weighted MRI was most sensitive for detecting fluid and interface separation at the implant-cement interface.

Conclusions:

• All-polymer PEEK knee prostheses exhibit favorable imaging characteristics in cadavers, with good visibility of simulated complications and no relevant metal artifacts.
• These findings indicate potential imaging advantages for future clinical follow-up of polymer-based implants.
• Direct comparative clinical studies are necessary to confirm these advantages.