title: [T2 and T1rho values of the knee joint cartilage].
abstract: Measurement of T(2) and T(1)ρ relaxation time is a quantitative evaluation technique that uses magnetic resonance imaging. This study aimed to evaluate T(2) and T(1)ρ relaxation time considering the load on the knee. 14 healthy volunteers were studied at 3 T. Four main compartments were defined for cartilage analysis in the knee joint: lateral femoral condyle (LFC), medial femoral condyle (MFC), and lateral and medial tibia (LT and MT). Femur cartilage was partitioned into anterior, middle, and posterior nonweight-bearing (a-NWB, m-NWB, p-NWB) portions and weight-bearing (WB) portions. T(2) and T(1)ρ values between the medial side and lateral side indicated a nonsignificant difference. T(2) and T(1)ρ values of NWB portions were higher than those of WB portions. The measured value rate of extension of NWB to WB was more remarkable in the T(1)ρ value than in the T(2) value. Therefore, evaluating cartilaginous injuries and damages using the T(1)ρ value seems to more effectively describe them.
authors.affiliation: Department of Radiology, Kitasato Institute Hospital.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Suzuki
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Katsumata
authors.forename: Masashi
authors.initials: M
authors.lastname: Matsuzaki
authors.forename: Kazunori
authors.initials: K
authors.lastname: Yamada
authors.forename: Ryutaro
authors.initials: R
authors.lastname: Nakagami
authors.forename: Mamoru
authors.initials: M
authors.lastname: Niitsu
mesh_terms: D000328:Adult; D002358:Cartilage, Articular / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000033:anatomy & histology*; D008279:Magnetic Resonance Imaging; D008297:Male; D016474:Weight-Bearing