Sammendrag
Purpose: To evaluate the effect of imaging plane and experience of observers on the reliability of T2 mapping of
native and repair cartilage tissue of the knee.
Methods: Fifteen consecutive patients from two randomised controlled trials (RCTs) were included in this crosssectional
study. Patients with an isolated knee cartilage lesion were randomised to receive either debridement or
microfracture (RCT 1) or debridement or autologous chondrocyte implantation (RCT 2). T2 mapping was performed
in coronal and sagittal planes two years postoperatively. A musculoskeletal radiologist, a resident of radiology and
two orthopaedic surgeons measured the T2 values independently. Intraclass Correlation Coefficient (ICC) with 95%
Confidence Intervals was used to calculate the inter- and intraobserver agreement.
Results: Mean age for the patients was 36.8 ± 11 years, 8 (53%) were men. The overall interobserver agreement
varied from poor to good with ICCs in the range of 0.27– 0.76 for native cartilage and 0.00 – 0.90 for repair tissue. The
lowest agreement was achieved for evaluations of repair cartilage tissue. The estimated ICCs suggested higher interand
intraobserver agreement for radiologists. On medial femoral condyles, T2 values were higher for native cartilage
on coronal images (p
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