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Conventional MRI-based subchondral trabecular biomarkers as predictors of knee osteoarthritis progression: data from the Osteoarthritis Initiative

  • Musculoskeletal
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Abstract

Objectives

To evaluate the reliability and validity of measuring subchondral trabecular biomarkers in “conventional” intermediate-weighted (IW) MRI sequences and to assess the predictive value of biomarker changes for predicting near-term symptomatic and structural progressions in knee osteoarthritis (OA).

Methods

For this study, a framework for measuring trabecular biomarkers in the proximal medial tibia in the “conventional” IW MRI sequence was developed. The reliability of measuring these biomarkers (trabecular thickness [cTbTh], spacing [cTbSp], connectivity density [cConnD], and bone-to-total volume ratio [cBV/TV]) was evaluated in the Bone Ancillary Study (within the Osteoarthritis Initiative [OAI]). The validity of these measurements was assessed by comparing to “apparent” biomarkers (from high-resolution steady-state MRI sequence) and peri-articular bone marrow density (BMD, from dual-energy X-ray absorptiometry). The association of these biomarker changes from baseline to 24 months (using the Reliable Change Index) with knee OA progression was studied in the FNIH OA Biomarkers Consortium (within the OAI). Pain and radiographic progression were evaluated by comparing baseline WOMAC pain score and radiographic joint space width with the 24-to-48-month scores/measurements. Associations between biomarker changes and these outcomes were studied using logistic regression adjusted for the relevant covariates.

Results

With acceptable reliability, the cTbTh and cBV/TV, but not cTbSp or cConnD, were modestly associated with the “apparent” biomarkers and peri-articular BMD (β: 1.10 [95% CI: 0.45–1.75], p value: 0.001 and β: 3.69 [95% CI: 2.56–4.83], p value: < 0.001, respectively). Knees with increased cTbTh had higher (OR: 1.44 [95% CI: 1.03–2.02], p value: 0.035) and knees with decreased cTbTh (OR: 0.69 [95% CI: 0.49–0.95], p value: 0.026) or decreased cBV/TV (OR: 0.67 [95% CI: 0.48–0.93], p value: 0.018) had lower odds of experiencing OA pain progression over the follow-ups.

Conclusions

Measurement of certain “conventional” MRI-based subchondral trabecular biomarkers has high reliability and modest validity. Though modest, there are significant associations between these biomarker changes and knee OA pain progression up to 48-month follow-up.

Key Points

• Despite the lower spatial resolution than what is required to accurately study the subchondral trabecular microstructures, the “conventional” IW MRI sequences may retain adequate information that allows quantification of trabecular microstructure biomarkers.

• Subchondral trabecular biomarkers obtained from “conventional” IW MRI sequences (i.e., cTbTh, cTbSp, and cBV/TV) are reliable and valid measures of trabecular microstructure changes compared to those from “apparent” trabecular biomarkers (from the FISP MRI sequence) and peri-articular BMD (from DXA).

• Increased trabecular thickness and bone-to-total ratio (cTbTh and cBV/TV, obtained from “conventional” IW MRI sequences) from baseline to 24-month visits may be associated with higher odds of knee OA pain progression over 48 months of follow-up.

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Data availability

The de-identified clinical and demographic information of subjects is publically available at the OAI project data repository at https://oai.nih.gov. The codes for the image segmentation and analysis framework, the dataset of subchondral trabecular biomarker measurements, and the R codes used in this work are available from the corresponding author upon reasonable requests.

Abbreviations

μCT:

Micro-computed tomography

BMI:

Body mass index

BV/TV:

Bone-to-total volume ratio

CI:

Confidence interval

ConnD:

Connectivity density

CT:

Computed tomography

DXA:

Dual-energy X-ray absorptiometry

FISP:

3D fast imaging with steady-state precession

FNIH:

Foundation for the National Institutes of Health

HR-QCT:

High-resolution quantitative computed tomography

ICC:

Intraclass correlation coefficient

IW:

Intermediate-weighted

JSW:

Joint space width

KLG:

Kellgren and Lawrence grade

MRI:

Magnetic resonance imaging

OA:

Osteoarthritis

OAI:

Osteoarthritis Initiative

OR:

Odds ratio

RCI:

Reliable Change Index

ROIs:

Regions of interest

TbSp:

Trabecular spacing

TbTh:

Trabecular thickness

WOMAC:

Western Ontario and McMaster Universities Osteoarthritis Index

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Acknowledgments

The OAI was a collaborative project between the public and private sectors. This project included the five contracts N01-AR-2-2258, N01-AR-2-2259, N01-AR-2-2260, N01-AR-2-2261, and N01-AR-2-2262 and was conducted by the OAI project investigators. The OAI was financially supported by the National Institutes of Health (NIH). Private funding partners were Merck Research Laboratories, Novartis Pharmaceuticals Corporation, GlaxoSmithKline, and Pfizer, Inc.

In preparing this manuscript, OAI project publicly available datasets were used, and the results of this work do not necessarily reflect the opinions of the OAI project investigators, the NIH, or the private funding partners.

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The authors state that this work has not received any funding.

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Correspondence to Farhad Pishgar.

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Guarantor

The scientific guarantor of this publication is Shadpour Demehri MD (Johns Hopkins University).

Conflict of interest

The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

Statistics and biometry

One of the authors has significant statistical expertise.

Informed consent

Subjects have given informed consent before participating in the OAI project.

Ethical approval

The medical ethics review boards of the University of California, San Francisco (Approval Number: 10-00532) and the four OAI project clinical centers recognized the project as Health Insurance Portability and Accountability Act (HIPAA)–compliant.

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• Case-control study

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Pishgar, F., Guermazi, A., Roemer, F.W. et al. Conventional MRI-based subchondral trabecular biomarkers as predictors of knee osteoarthritis progression: data from the Osteoarthritis Initiative. Eur Radiol 31, 3564–3573 (2021). https://doi.org/10.1007/s00330-020-07512-2

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