MR imaging of hip arthroplasty implants

Area of Science:

• Orthopedic Surgery
• Radiology
• Biomedical Engineering

Background:

• Hip arthroplasty is standard for end-stage hip disease, but up to 40% experience post-operative pain.
• Implant failure and complications necessitate accurate diagnostic tools for painful hip arthroplasty.
• Increasing hip arthroplasty rates and specific implant types (metal-on-metal) raise concerns for adverse reactions.

Purpose of the Study:

• To present strategies for magnetic resonance (MR) imaging of hip arthroplasty implants.
• To detail MR imaging appearances of common causes of painful and dysfunctional hip arthroplasty.
• To highlight MR imaging's role in diagnosis, prognosis, risk stratification, and surgical planning for hip arthroplasty complications.

Main Methods:

• Utilizing optimized conventional pulse sequences for MR imaging.
• Implementing metal artifact reduction techniques to enhance image quality.
• Systematic evaluation of MR images using a provided checklist.

Main Results:

• Optimized MR imaging with artifact reduction improves depiction of bone, implant-tissue interfaces, and periprosthetic soft tissues.
• MR imaging can identify various complications: stress reactions, fractures, aseptic loosening, polyethylene wear, adverse local tissue reactions, infection, heterotopic ossification, tendinopathy, neuropathy, and neoplasms.
• Provides crucial information for diagnosing and managing painful hip arthroplasty.

Conclusions:

• MR imaging is a powerful and comprehensive tool for evaluating hip arthroplasty.
• Optimized MR techniques are essential for diagnosing complications in painful hip arthroplasty.
• MR imaging aids in risk stratification and surgical planning for patients with hip arthroplasty implants.