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Scrutinizing the cut-off for “pathological” meniscal body extrusion on knee MRI

Svensson, F. LU ; Felson, D. T.; Turkiewicz, A. LU ; Guermazi, A.; Roemer, F. W. LU ; Neuman, P. LU and Englund, M. LU (2019) In European Radiology
Abstract

Objectives: Medial meniscal body extrusion ≥ 3 mm on MRI is often considered “pathologic.” The aims of this study were to (1) assess the adequacy of 3 mm as cut-off for “pathological” extrusion and (2) find an optimal cut-off for meniscal extrusion cross-sectionally associated with radiographic knee osteoarthritis, bone marrow lesions (BMLs), and cartilage damage. Methods: Nine hundred fifty-eight persons, aged 50–90 years from Framingham, MA, USA, had readable 1.5 T MRI scans of the right knee for meniscal body extrusion (measured in mm). BMLs and cartilage damage were read using the whole organ magnetic resonance imaging score (WORMS). Knee X-rays were read according to the Kellgren and Lawrence (KL) scale. We evaluated the... (More)

Objectives: Medial meniscal body extrusion ≥ 3 mm on MRI is often considered “pathologic.” The aims of this study were to (1) assess the adequacy of 3 mm as cut-off for “pathological” extrusion and (2) find an optimal cut-off for meniscal extrusion cross-sectionally associated with radiographic knee osteoarthritis, bone marrow lesions (BMLs), and cartilage damage. Methods: Nine hundred fifty-eight persons, aged 50–90 years from Framingham, MA, USA, had readable 1.5 T MRI scans of the right knee for meniscal body extrusion (measured in mm). BMLs and cartilage damage were read using the whole organ magnetic resonance imaging score (WORMS). Knee X-rays were read according to the Kellgren and Lawrence (KL) scale. We evaluated the performance of the 3-mm cut-off with respect to the three outcomes and estimated a new cut-off maximizing the sum of sensitivity and specificity. Results: The study persons had mean age of 62.2 years, 57.0% were women and the mean body mass index was 28.5 kg/m2. Knees with radiographic osteoarthritis, BMLs, and cartilage damage had overall more meniscal extrusion than knees without. The 3-mm cut-off had moderate sensitivity and low specificity for all three outcomes (sensitivity between 0.68 [95% CI 0.63–0.73] and 0.81 [0.73–0.87], specificity between 0.49 [0.45–0.52] and 0.54 [0.49–0.58]). Using 4 mm maximized the sum of sensitivity and specificity and improved the percentage of correctly classified subjects (from between 54 and 61% to between 64 and 79%). Conclusions: The 4-mm cut-off may be used as an alternative cut-off for denoting pathological meniscal extrusion. Key Points: • Medial meniscal body extrusion is strongly associated with osteoarthritis. • The 3-mm cut-off for medial meniscal body extrusion has high sensitivity but low specificity with respect to bone marrow lesions, cartilage damage, and radiographic osteoarthritis. • The 4-mm cut-off maximizes the sensitivity and specificity with respect to all three osteoarthritis features.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Cartilage, Knee joint, Magnetic resonance imaging, Meniscus, Osteoarthritis
in
European Radiology
publisher
Springer
external identifiers
  • scopus:85059847462
ISSN
0938-7994
DOI
10.1007/s00330-018-5914-0
language
English
LU publication?
yes
id
a4fd157b-7096-4a6b-aa58-044aa1127f64
date added to LUP
2019-01-24 10:29:17
date last changed
2019-04-26 03:00:21
@article{a4fd157b-7096-4a6b-aa58-044aa1127f64,
  abstract     = {<p>Objectives: Medial meniscal body extrusion ≥ 3 mm on MRI is often considered “pathologic.” The aims of this study were to (1) assess the adequacy of 3 mm as cut-off for “pathological” extrusion and (2) find an optimal cut-off for meniscal extrusion cross-sectionally associated with radiographic knee osteoarthritis, bone marrow lesions (BMLs), and cartilage damage. Methods: Nine hundred fifty-eight persons, aged 50–90 years from Framingham, MA, USA, had readable 1.5 T MRI scans of the right knee for meniscal body extrusion (measured in mm). BMLs and cartilage damage were read using the whole organ magnetic resonance imaging score (WORMS). Knee X-rays were read according to the Kellgren and Lawrence (KL) scale. We evaluated the performance of the 3-mm cut-off with respect to the three outcomes and estimated a new cut-off maximizing the sum of sensitivity and specificity. Results: The study persons had mean age of 62.2 years, 57.0% were women and the mean body mass index was 28.5 kg/m<sup>2</sup>. Knees with radiographic osteoarthritis, BMLs, and cartilage damage had overall more meniscal extrusion than knees without. The 3-mm cut-off had moderate sensitivity and low specificity for all three outcomes (sensitivity between 0.68 [95% CI 0.63–0.73] and 0.81 [0.73–0.87], specificity between 0.49 [0.45–0.52] and 0.54 [0.49–0.58]). Using 4 mm maximized the sum of sensitivity and specificity and improved the percentage of correctly classified subjects (from between 54 and 61% to between 64 and 79%). Conclusions: The 4-mm cut-off may be used as an alternative cut-off for denoting pathological meniscal extrusion. Key Points: • Medial meniscal body extrusion is strongly associated with osteoarthritis. • The 3-mm cut-off for medial meniscal body extrusion has high sensitivity but low specificity with respect to bone marrow lesions, cartilage damage, and radiographic osteoarthritis. • The 4-mm cut-off maximizes the sensitivity and specificity with respect to all three osteoarthritis features.</p>},
  author       = {Svensson, F. and Felson, D. T. and Turkiewicz, A. and Guermazi, A. and Roemer, F. W. and Neuman, P. and Englund, M.},
  issn         = {0938-7994},
  keyword      = {Cartilage,Knee joint,Magnetic resonance imaging,Meniscus,Osteoarthritis},
  language     = {eng},
  month        = {01},
  publisher    = {Springer},
  series       = {European Radiology},
  title        = {Scrutinizing the cut-off for “pathological” meniscal body extrusion on knee MRI},
  url          = {http://dx.doi.org/10.1007/s00330-018-5914-0},
  year         = {2019},
}