Kim SK, et al. - The clinical value of pointwise encoding time reduction with radial acquisition (PETRA) sequence for the diagnosis of internal derangement of the knee was evaluated. For the purpose of this investigation, the major structures of the knee in thirty-four patients were assessed and compared among conventional MRI findings, PETRA images, and arthroscopic findings. Results revealed that the specificities of PETRA with 2D FSE sequence were higher for meniscal lesions than those obtained when using 2D FSE alone. The accuracy of assessing internal derangements of the knee and, especially, meniscal lesions was increased by using PETRA images along with conventional 2D FSE images.