A quantitative metric for knee osteoarthritis: reference values of joint space loss

Ratzlaff C, Ashbeck EL, Guermazi A, Roemer F, Duryea J, Kwoh CK (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Osteoarthritis and Cartilage Elsevier

Book Volume: 26

Pages Range: 1215-1224

Journal Issue: 9

DOI: 10.1016/j.joca.2018.05.014

Abstract

OBJECTIVES: Knee osteoarthritis (OA) onset and progression has been defined with transitions in Kellgren-Lawrence (KL) grade or Osteoarthritis Research Society International (OARSI) Joint Space Narrowing (JSN) grade. We quantitatively describe one-year transitions in KL grade and JSN, using fixed joint space width (fJSW), among knees with or at risk of OA. METHODS: Radiographic assessments from the Osteoarthritis Initiative (OAI) were used to identify transitions in KLG and JSN grade between consecutive annual visits. The fJSW was measured in the medial and lateral compartments. The distribution of change in fJSW for KLG and JSN transitions were described, and mean change in fJSW was estimated using mixed models. RESULTS: KL grade and JSN scores were available for about 20,000 annual transitions from 6047 knees contributed by 3389 participants. Knees that remained stable in KL or OARSI-JSN over 1 year had mean medial fJSW loss between -0.06 and -0.19 mm/year. Transition from KL grade 0 to 1, 0 to 2, and KL 1 to 2 were similar with respect to mean medial fJSW loss (0.18-0.28 mm). Greatest annual changes in medial fJSW corresponded to KL 0 to 3 (1.62 mm), KL 2 to 4 (1.23 mm) and JSN 0 to 2 (1.85 mm). CONCLUSIONS: Anchoring quantitatively measured loss of joint space width to transitions in KL grade and JSN provides reference values based on traditional definitions of knee OA onset and progression.

Authors with CRIS profile

Frank Roemer Institute of Radiology

Involved external institutions

University of Arizona US United States (USA) (US) Boston University US United States (USA) (US) Brigham and Women's Hospital (BWH) US United States (USA) (US)

How to cite

APA:

Ratzlaff, C., Ashbeck, E.L., Guermazi, A., Roemer, F., Duryea, J., & Kwoh, C.K. (2018). A quantitative metric for knee osteoarthritis: reference values of joint space loss. Osteoarthritis and Cartilage, 26(9), 1215-1224. https://dx.doi.org/10.1016/j.joca.2018.05.014

MLA:

Ratzlaff, C., et al. "A quantitative metric for knee osteoarthritis: reference values of joint space loss." Osteoarthritis and Cartilage 26.9 (2018): 1215-1224.

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