Abstract
This study aims to evaluate and compare extremity-MRi with specialized radiography by measuring articular cartilage height in patients with knee osteoarthritis.A prospective study, including sixty patients. Measurements on MRi images, Rosenberg view, and coronal stress radiographs were performed. MRI was compared to specialized radiography.Measurements in the medial compartment showed negligible/weak correlation between MRi and Rosenber/varus stress. In the lateral compartment, MRi and the Rosenberg/valgus stress view were strongly correlated.We conclude that MRi cannot replace radiographs for the measurement of articular cartilage thickness. MRi should, however, be reserved for more unusual cases of atypical clinical findings.
Highlights
To ensure the correct knee implant for the right patient, it is essential to know how different imaging types discriminate between the levels of degenerative disease in the different compartments
Mean measurements were 1.6(1.7)/1.0(1.3)mm in the medial compartment in varus stress and 5.9(1.6)/5.1(1.7)mm in the lateral compartment in valgus stress.[13]
Medial tibiofemoral compartment No significant correlation was found between magnetic resonance imaging (MRi) and specialized radiography when measuring joint space width (JSW)/minimal joint space width (mJSW) in the medial knee compart ment
Summary
To ensure the correct knee implant for the right patient, it is essential to know how different imaging types discriminate between the levels of degenerative disease in the different compartments. The usefulness in detecting severe OA is less clear.[1] In clinical practice, MRi is generally not included in the decision-making process when considering knee arthroplasty surgery. It has been criticized in the work-up for knee replacements due to the over-estimation of knee pa thology, pricing, and time consumption in healthcare systems where cost efficiency is essential. Some areas of the world see an increasing use of MRi for endstage knee OA, this possible rise in costs could be minimized when using an extremity-MRi scanner, which is cheaper Though, this often is accompanied by imaging with lower field strength and resolution on the acquired images
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