# Provocation CT-Based Analysis for Diagnosis of Hip and Knee Arthroplasty Aseptic Loosening: Where Are We at? A Systematic Review of Clinical Trials

## TL;DR

This review evaluates provocation CT as a promising alternative to traditional methods for detecting implant loosening in hip and knee replacements.

## Contribution

The paper systematically reviews the current evidence on provocation CT's effectiveness for diagnosing aseptic loosening in joint implants.

## Key findings

- Provocation CT showed higher sensitivity and specificity than standard radiographs for detecting implant loosening.
- CT scans had effective radiation doses ranging from 0.2 to 4.5 mSv per scan.
- Provocation CT performed comparably to RSA in motion detection but lacks direct clinical comparison.

## Abstract

Background/Objectives: Aseptic loosening is a major challenge in hip and knee arthroplasty. While radiostereometric analysis (RSA) is the gold standard for detecting early migration, it is static, costly, and requires metal beads. Provocation CT-based analysis studies implants under physiological stresses and offers a marker-free alternative with comparable accuracy. This systematic review evaluates its effectiveness, cost, and role in orthopedic imaging. Methods: A systematic review was conducted following the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines. Three databases were searched, with no date restrictions, using keywords related to the research area. The risk of bias was assessed using the RoB-1 tool. Results: The initial search identified 42 studies, with 6 ultimately included in the review. These studies involved 198 patients with an average age of 65.0 years. Provocation CT demonstrated higher sensitivity and specificity than standard radiographs, particularly in cases with inconclusive X-rays. Additionally, the radiation dose for CT scans varied across studies, with effective doses ranging from 0.2 mSv to 4.5 mSv per scan. Compared to X-ray, CT-based methods showed comparable or superior performance in motion detection, though direct clinical comparisons with RSA remain lacking. Conclusions: Provocation CT-based analysis is a valuable diagnostic tool for early detection of implant loosening, offering a potentially feasible, accurate, and cost-effective alternative to traditional methods. However, standardized protocols, broader economic evaluations, and prospective multicenter trials are needed to confirm its routine clinical applicability.