Comparison of cartilage thickness with radiologic grade of knee osteoarthritis

Filippo Agnesi, Kimberly K. Amrami, Carlo A. Frigo, Kenton R Kaufman

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Objective: To compare joint space width (JSW) measurements obtained from magnetic resonance imaging (MRI) with a semi-automated computer algorithm to the Kellgren and Lawrence grading of osteoarthritis (OA). Materials and methods: Three hundred and six patients (234 female, 72 male) with a mean age of 56.7 years (range 31-81 years) underwent MRI of their knees with a fast oblique spiral spoiled gradient (SPGR) sequence. A board-certified musculoskeletal radiologist graded the OA of all the patients in accordance with the Kellgren and Lawrence OA scale. A previously validated computer algorithm was used to determine the minimum JSW for both the tibiofemoral joint and the patellofemoral joint. An analysis of variance (ANOVA) with the Student-Newman-Kuels post-hoc test was used to determine if there were differences in JSW as a function of OA grade. Results: The radiologic grade of OA was inversely associated with the JSW. In the medial compartment the JSW did not change significantly between grade 1 and grade 2, but there was a significant decrease in JSW between grade 0 (normal) and grade 1 and for each OA grade above grade 2. In the lateral compartment no statistical differences were found till grade 2, while grade 3 was found to be statistically different from the previous one. The number of patients with a grade 4 patellofemoral OA was too low for the statistical significance to be assessed. In the patellofemoral joint the JSW did not change significantly until grade 2, while a statistically significant reduction was found for both grade 3 and grade 4. Conclusion: This study showed that an inverse non-linear relationship exists between radiologic grade and JSW. The relationship differs for the tibiofemoral and the patellofemoral joint.

Original languageEnglish (US)
Pages (from-to)639-643
Number of pages5
JournalSkeletal Radiology
Volume37
Issue number7
DOIs
StatePublished - Jul 2008

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Knee Osteoarthritis
Cartilage
Joints
Osteoarthritis
Patellofemoral Joint
Magnetic Resonance Imaging
Knee
Analysis of Variance
Students

Keywords

  • Cartilage
  • Computer program
  • Knee
  • MRI
  • Musculoskeletal disease
  • Osteoarthritis

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Comparison of cartilage thickness with radiologic grade of knee osteoarthritis. / Agnesi, Filippo; Amrami, Kimberly K.; Frigo, Carlo A.; Kaufman, Kenton R.

In: Skeletal Radiology, Vol. 37, No. 7, 07.2008, p. 639-643.

Research output: Contribution to journalArticle

Agnesi, Filippo ; Amrami, Kimberly K. ; Frigo, Carlo A. ; Kaufman, Kenton R. / Comparison of cartilage thickness with radiologic grade of knee osteoarthritis. In: Skeletal Radiology. 2008 ; Vol. 37, No. 7. pp. 639-643.
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abstract = "Objective: To compare joint space width (JSW) measurements obtained from magnetic resonance imaging (MRI) with a semi-automated computer algorithm to the Kellgren and Lawrence grading of osteoarthritis (OA). Materials and methods: Three hundred and six patients (234 female, 72 male) with a mean age of 56.7 years (range 31-81 years) underwent MRI of their knees with a fast oblique spiral spoiled gradient (SPGR) sequence. A board-certified musculoskeletal radiologist graded the OA of all the patients in accordance with the Kellgren and Lawrence OA scale. A previously validated computer algorithm was used to determine the minimum JSW for both the tibiofemoral joint and the patellofemoral joint. An analysis of variance (ANOVA) with the Student-Newman-Kuels post-hoc test was used to determine if there were differences in JSW as a function of OA grade. Results: The radiologic grade of OA was inversely associated with the JSW. In the medial compartment the JSW did not change significantly between grade 1 and grade 2, but there was a significant decrease in JSW between grade 0 (normal) and grade 1 and for each OA grade above grade 2. In the lateral compartment no statistical differences were found till grade 2, while grade 3 was found to be statistically different from the previous one. The number of patients with a grade 4 patellofemoral OA was too low for the statistical significance to be assessed. In the patellofemoral joint the JSW did not change significantly until grade 2, while a statistically significant reduction was found for both grade 3 and grade 4. Conclusion: This study showed that an inverse non-linear relationship exists between radiologic grade and JSW. The relationship differs for the tibiofemoral and the patellofemoral joint.",
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