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Assessment of progression in knee osteoarthritis: results of a 1 year study comparing arthroscopy and MRI.

  [ 82 votes ]   [ Discuss This Article ] • May 19, 2003

Pessis E, Drape JL, Ravaud P, Chevrot A, Dougados M, Ayral X.

Department of Radiology B, Hopital Cochin, AP-HP, Universite Paris V, Paris, France

OBJECTIVE: The objectives of this study were to determine the sensitivity to change of magnetic resonance imaging (MRI) quantification of chondropathy after 1 year in osteoarthritis of the medial tibiofemoral compartment and to assess the predictive value of subchondral bone marrow edema and bone abnormalities on progression of chondropathy.

DESIGN: Twenty patients with symptomatic knee osteoarthritis of the medial compartment underwent a prospective, longitudinal study. All patients were evaluated the same day at entry and after 1 year by plain weight-bearing radiographs, MRI with a three-dimensional gradient-echo sequence, using a 0.2-T dedicated MR unit, and arthroscopy. The medial tibiofemoral chondropathy was quantified blindly with MRI and arthroscopy using the French Society of Arthroscopy (SFA) score. Presence of subchondral bone marrow edema and bone abnormalities on initial MRI was recorded in order to evaluate their influence on both unchanged and worsened chondropathy after 1 year.

RESULTS: After 1 year, no statistically significant changes were observed with plain radiographs and arthroscopy. At variance, a statistically significant worsening of chondropathy was found with MRI using the SFA-MR score (P=0.01). SFA-MR score was the most responsive outcome. Absence of subchondral bone abnormalities and bone marrow edema on initial MR assessment predicted absence of worsening of chondropathy after 1 year.

CONCLUSION: MRI appears promising for evaluating progression of knee osteoarthritis.

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