Department of Radiology, Soonchunhyang University College of Medicine, Bucheon Hospital, Bucheon 420-767, Korea.
Korean J Radiol. 2012 Sep-Oct;13(5):594-601. doi: 10.3348/kjr.2012.13.5.594. Epub 2012 Aug 28.
To compare changes in T2 relaxation on magnetic resonance (MR) images of knee articular cartilage in younger and older amateur athletes before and after running.
By using a 3.0-T MR imager, quantitative T2 maps of weight-bearing femoral and tibial articular cartilages in 10 younger and 10 older amateur athletes were acquired before, immediately after, and 2 hours after 30 minutes of running. Changes in global cartilage T2 signals of the medial and lateral condyles of the femur and tibia and regional cartilage T2 signals in the medial condyles of femoral and tibia in response to exercise were compared between the two age groups.
Changes in global cartilage T2 values after running did not differ significantly between the age groups. In terms of the depth variation, relatively higher T2 values in the older group than in the younger group were observed mainly in the superficial layers of the femoral and tibial cartilage (p < 0.05).
Age-related cartilage changes may occur mainly in the superficial layer of cartilage where collagen matrix degeneration is primarily initiated. However, no trend is observed regarding a global T2 changes between the younger and older age groups in response to exercise.
比较年轻和老年业余运动员跑步前后膝关节软骨 T2 弛豫时间（T2 relaxation）在磁共振（MR）图像上的变化。
使用 3.0T MR 成像仪，在 10 名年轻和 10 名老年业余运动员跑步前、跑步后即刻和 30 分钟后 2 小时，对负重股骨和胫骨关节软骨的定量 T2 图谱进行采集。比较两组年龄人群在运动后股骨和胫骨内外侧髁的整体软骨 T2 信号和股骨及胫骨内侧髁的局部软骨 T2 信号的变化。
两组人群在跑步后的整体软骨 T2 值变化无显著差异。就深度变化而言，与年轻组相比，老年组在股骨和胫骨软骨的浅层（p<0.05）观察到相对更高的 T2 值。
与运动相关的软骨变化可能主要发生在胶原基质退化首先发生的软骨浅层。然而，在运动后年轻和老年年龄组之间，并未观察到整体 T2 变化的趋势。
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