Kobayashi Tatsuo, Fujikawa Kyosuke, Nemoto Koichi, Yamazaki Mutsuo, Obara Minoru, Sato Shunichi
Department of Orthopedic Surgery, National Defense Medical College, 3-2, Namiki, Tokorozawa, Saitama 359-8513, Japan.
Knee. 2005 Dec;12(6):447-53. doi: 10.1016/j.knee.2005.04.001. Epub 2005 Jun 20.
In evaluating patello-femoral alignment, it is not enough to assess the conformity of the joint two-dimensionally, the direction of the extensor mechanism must be examined three-dimensionally. Using magnetic resonance imaging (MRI), we adopted an ideal extensor mechanism plane intersecting the patellar facet of the femur centrally and perpendicularly. We evaluated the alignment according to the extent to which the patella and/or the tibial tuberosity deviated from the plane. The results suggested that our method is useful for indicating proximal and distal realignment. Furthermore, two-dimensional finite element analysis in the patello-femoral joint showed that peak stress was significantly higher in the dislocation group than in the no-dislocation group. This indicates that osteoarthritic change in the future is a risk in the dislocation group.
在评估髌股关节对线时，仅二维评估关节的贴合度是不够的，必须三维检查伸肌机制的方向。我们使用磁共振成像（MRI），采用一个理想的伸肌机制平面，该平面在股骨髌面中央且垂直相交。我们根据髌骨和/或胫骨结节偏离该平面的程度来评估对线情况。结果表明，我们的方法有助于指示近侧和远侧重新对线。此外，髌股关节的二维有限元分析表明，脱位组的峰值应力明显高于非脱位组。这表明脱位组未来发生骨关节炎改变的风险较高。
