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Research ArticleArticle

A New Approach Yields High Rates of Radiographic Progression in Knee Osteoarthritis

DAVID T. FELSON, MICHAEL C. NEVITT, MEI YANG, MARGARET CLANCY, JINGBO NIU, JAMES C. TORNER, C. ELIZABETH LEWIS, PIRAN ALIABADI, BURTON SACK, CHARLES McCULLOCH and YUQING ZHANG
The Journal of Rheumatology October 2008, 35 (10) 2047-2054;
DAVID T. FELSON
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  • For correspondence: dfelson@bu.edu
MICHAEL C. NEVITT
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MEI YANG
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MARGARET CLANCY
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JINGBO NIU
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JAMES C. TORNER
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C. ELIZABETH LEWIS
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PIRAN ALIABADI
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BURTON SACK
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CHARLES McCULLOCH
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YUQING ZHANG
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Abstract

Objective

Progression of knee osteoarthritis (OA) has typically been assessed in the medial tibiofemoral (TF) compartment on the anteroposterior (AP) or posteroanterior (PA) view. We propose a new approach using multiple views and compartments that is likely to be more sensitive to change and reveals progression throughout the knee.

Methods

We tested our approach in the Multicenter Osteoarthritis Study, a study of persons with OA or at high risk of disease. At baseline and 30 months, subjects provided PA (fixed flexion without fluoro) and lateral weight-bearing knee radiographs. Paired radiographs were read by 2 readers who scored joint space (JS) using a 0–3 atlas-based scale. When JS narrowed but narrowing did not reach a full grade on the scale, readers used half-grades. Change was scored in medial and lateral TF compartments on both PA and lateral views and in the patellofemoral (PF) joint on lateral view. A knee showed progression when there was at least a half-grade worsening in JS width in any compartment at followup. Disagreements were adjudicated by a panel of 3 readers. To validate progression, we tested definitions for TF progression to see if malalignment on long-limb radiographs at baseline (≥ 3° malaligned in any direction with nonmalaligned knees being reference) increased risk of progression. A valid definition of progression would show that malalignment strongly predicted progression.

Results

We studied 842 knees with either Kellgren-Lawrence grade ≥ 2 or PF OA at baseline in 606 subjects (age range 50–79 yrs, mean 63.9 yrs; 66.6% women). Mean body mass index was 31.9, and 32.8% of knees had frequent knee pain at baseline. Of these, 500 knees (59.4%) showed progression. Of the 500, 75 (15%) had progression only in the PF joint, while the remainder had progression in the TF joint. Malalignment increased the risk of overall progression in TF joint and increased the risk of half-grade progression, suggesting that half-grade progression had validity.

Conclusion

PA and lateral views obtained in persons at high risk of OA progression can produce a cumulative incidence of progression above 50% at 30 months. Keys to increasing the yield include imaging PF and lateral compartments, using semiquantitative scales designed to detect change, and examining more than one radiographic view.

Key Indexing Terms:
  • OSTEOARTHRITIS
  • KNEE
  • RADIOGRAPHY

Footnotes

  • D.T. Felson, MD, MPH, Clinical Epidemiology Research and Training Unit, Boston University School of Medicine; M.C. Nevitt, PhD, Department of Epidemiology and Biostatistics, University of California; M. Yang, MS; M. Clancy, MS, MPH; J. Niu, DSc, Clinical Epidemiology Research and Training Unit, Boston University School of Medicine; J.C. Torner, PhD, Department of Epidemiology, University of Iowa; C.E. Lewis, MD, Division of Preventive Medicine, University of Alabama at Birmingham; P. Aliabadi, MD, Department of Radiology, Brigham and Women’s Hospital; B. Sack, MD, Clinical Epidemiology Research and Training Unit, Boston University School of Medicine; C. McCulloch, PhD, Department of Epidemiology and Biostatistics, University of California; Y. Zhang, DSc, Clinical Epidemiology Research and Training Unit, Boston University School of Medicine.

  • Supported by NIH U01 AG18820, U01 AG18832, U01 AG18947, U01 AG19069, and by NIH AR47785.

    • Accepted for publication May 27, 2008.
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The Journal of Rheumatology
Vol. 35, Issue 10
1 Oct 2008
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A New Approach Yields High Rates of Radiographic Progression in Knee Osteoarthritis
DAVID T. FELSON, MICHAEL C. NEVITT, MEI YANG, MARGARET CLANCY, JINGBO NIU, JAMES C. TORNER, C. ELIZABETH LEWIS, PIRAN ALIABADI, BURTON SACK, CHARLES McCULLOCH, YUQING ZHANG
The Journal of Rheumatology Oct 2008, 35 (10) 2047-2054;

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A New Approach Yields High Rates of Radiographic Progression in Knee Osteoarthritis
DAVID T. FELSON, MICHAEL C. NEVITT, MEI YANG, MARGARET CLANCY, JINGBO NIU, JAMES C. TORNER, C. ELIZABETH LEWIS, PIRAN ALIABADI, BURTON SACK, CHARLES McCULLOCH, YUQING ZHANG
The Journal of Rheumatology Oct 2008, 35 (10) 2047-2054;
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