MR Arthrography Knee In patients with significant acute knee trauma with suspected or possible dislocation, MR arthrography of the knee is not routinely used as the initial imaging study. MRA Knee MRI is an accurate method used in the evaluation of soft-tissue, osseous, and neural injuries after knee dislocation [61]. MRA may be performed simultaneously with MRI for evaluation of internal derangement and vascular injuries with less morbidity compared with conventional angiography [62]. Potter et al [61] reported their experience with popliteal fossa MRA with encouraging results and complete agreement between the MRA and conventional angiography in patients who had both studies. Similarly, in a study by Tocci et al [62], MRA has been shown to be as accurate and useful as conventional angiography in the evaluation of popliteal artery injuries of patients with knee dislocations. MRI Knee With its superb contrast resolution and multiplanar imaging capability, MRI is proven to be a highly accurate imaging modality in the evaluation of bone marrow contusions and occult fractures [27-29] as well as meniscal [21,26] and ligamentous injuries [21,31,32]. It can be performed in conjunction with MRA for evaluation of internal derangement and vascular injuries with less morbidity compared with conventional angiography [62]. Bone Scan with SPECT or SPECT/CT Knee In patients with significant acute knee trauma with suspected/possible dislocation, Tc-99m bone scan with SPECT/CT is not routinely used as the initial imaging study. US Knee In patients with significant acute knee trauma with suspected or possible dislocation, US is not routinely used as the initial imaging study. Supporting Documents The evidence table, literature search, and appendix for this topic are available at https://acsearch. acr.org/list. The appendix includes the strength of evidence assessment and the final rating round tabulations for each recommendation.
Acute Trauma to the Knee. MR Arthrography Knee In patients with significant acute knee trauma with suspected or possible dislocation, MR arthrography of the knee is not routinely used as the initial imaging study. MRA Knee MRI is an accurate method used in the evaluation of soft-tissue, osseous, and neural injuries after knee dislocation [61]. MRA may be performed simultaneously with MRI for evaluation of internal derangement and vascular injuries with less morbidity compared with conventional angiography [62]. Potter et al [61] reported their experience with popliteal fossa MRA with encouraging results and complete agreement between the MRA and conventional angiography in patients who had both studies. Similarly, in a study by Tocci et al [62], MRA has been shown to be as accurate and useful as conventional angiography in the evaluation of popliteal artery injuries of patients with knee dislocations. MRI Knee With its superb contrast resolution and multiplanar imaging capability, MRI is proven to be a highly accurate imaging modality in the evaluation of bone marrow contusions and occult fractures [27-29] as well as meniscal [21,26] and ligamentous injuries [21,31,32]. It can be performed in conjunction with MRA for evaluation of internal derangement and vascular injuries with less morbidity compared with conventional angiography [62]. Bone Scan with SPECT or SPECT/CT Knee In patients with significant acute knee trauma with suspected/possible dislocation, Tc-99m bone scan with SPECT/CT is not routinely used as the initial imaging study. US Knee In patients with significant acute knee trauma with suspected or possible dislocation, US is not routinely used as the initial imaging study. Supporting Documents The evidence table, literature search, and appendix for this topic are available at https://acsearch. acr.org/list. The appendix includes the strength of evidence assessment and the final rating round tabulations for each recommendation.