ArticleSkeletal radiology2018
Pseudotumor in metal-on-metal hip arthroplasty: a comparison study of three grading systems with MRI.
Article in Skeletal radiology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed.
- Inflammatory Pseudotumor After Total Hip Arthroplasty-An Increasingly Recognized Complication.Orthopaedic surgery · 2026Review
- "Squeaky Hip": Are Noises Important?Arthroplasty today · 2026Article
- Pseudotumor following total hip arthroplasty: experience of a tertiary referral center and proposal of the new "PCS" classification system.Archives of orthopaedic and trauma surgery · 2025Article
- When Is a Two-Stage Surgical Procedure Indicated in the Treatment of Pseudotumors of the Hip? A Retrospective Study of 21 Cases and a Review of the Literature.Journal of clinical medicine · 2024Article
- Reactive Peri-Arthroplasty Pseudotumors: A Rare Cause of Hip Pain and Iatrogenic Sciatica.Cureus · 2023Article
- Imaging in Hip Arthroplasty Management Part 2: Postoperative Diagnostic Imaging Strategy.Journal of clinical medicine · 2022Review
- Semi-quantitative histology confirms that the macrophage is the predominant cell type in metal-on-metal hip tissues.Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2022Article
- Retention of metals in periprosthetic tissues of patients with metal-on-metal total hip arthroplasty is reflected in the synovial fluid to blood cobalt transfer ratio in the presence of a pseudotumour.BMC musculoskeletal disorders · 2020Article
- Standardizing terms for tribocorrosion-associated adverse local tissue reaction in total hip arthroplasty.Arthroplasty today · 2020Article
- Magnetic resonance imaging (MRI) versus single photon emission computed tomography (SPECT/CT) in painful total hip arthroplasty: a comparative multi-institutional analysis.The British journal of radiology · 2020Article
- MRI of THA Correlates With Implant Wear and Tissue Reactions: A Cross-sectional Study.Clinical orthopaedics and related research · 2019Article
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectivePseudotumors, a well-known complication of metal-on-metal total hip arthroplasty (MoM THA), are well identified on metal artifact-reducing sequences magnetic resonance imaging (MARS-MRI). Several MRI grading systems are described in the orthopedic literature, but their validity is unknown in large clinical studies. Our study was undertaken to describe the classification of pseudotumors in a preselected cohort divided into high- and low-risk patients, using three pseudotumor grading systems applied on MARS-MRI, and to determine the interobserver reliability of the grading systems. PATIENTS AND
methodsA retrospective study was performed on 377 consecutive patients (240 MRI scans) treated with an M2a-38 and Taperloc stem combination (Biomet, Warsaw, IN, USA). Patients were divided into a high-risk and a low-risk group based on previous published risk factors. Two observers determined the presence of pseudotumors using three different pseudotumor grading systems for classifying MARS-MRI results.
resultsThe prevalence of pseudotumors as determined with MARS-MRI was 59% in our high-risk group, 0% in the low-risk group and 43% in the control group. Serum cobalt values were increased in the high-risk group. The kappa values of the Anderson, Hauptfleisch and Matthies grading system scores were 0.43, 0.44, and 0.49 respectively.
conclusionsHigh-risk patients are at a high risk for pseudotumor development. No pseudotumor development was found in low-risk patients. Interobserver reliability scored best with the Matthies system, but all three grading systems showed only a moderate agreement.
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