MRA Knee MRA is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. MRI Knee MRI is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. MRI aids in diagnosis and further characterization of bone and soft-tissue injuries associated with transient lateral dislocation of the patella [53-55]. Bone Scan with SPECT or SPECT/CT Knee Tc-99m bone scan with SPECT/CT knee is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. US Knee US is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. Acute Trauma to the Knee Variant 7: Adult or child 5 years of age or older. Significant trauma to the knee (eg, motor vehicle accident, knee dislocation). Initial imaging. Arteriography Lower Extremity Vascular injury may be found in about 30% of patients following posterior knee dislocation [56]. Injuries of the popliteal artery require prompt surgical intervention to help limb preservation. Associated peroneal and tibial nerve injuries may cause significant morbidity and require an understanding of their pathophysiologic implications to maximize limb functionality [57]. Angiography has been the reference standard in the evaluation of vascular injuries associated with knee dislocations [58]. However, this is an invasive procedure with associated risk, and with the excellent performance of CTA and MRA, it is usually performed in selected cases [58]. CT Knee CT is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. CT is superior to knee radiographs in detection and classification of fractures [12]; however, without IV contrast, CT cannot detect vascular injuries. CTA Lower Extremity With suspected vascular injuries in the setting of knee dislocation, CTA is frequently used because it is less invasive and has a similarly high accuracy as conventional angiography [58-60].
Acute Trauma to the Knee. MRA Knee MRA is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. MRI Knee MRI is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. MRI aids in diagnosis and further characterization of bone and soft-tissue injuries associated with transient lateral dislocation of the patella [53-55]. Bone Scan with SPECT or SPECT/CT Knee Tc-99m bone scan with SPECT/CT knee is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. US Knee US is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. Acute Trauma to the Knee Variant 7: Adult or child 5 years of age or older. Significant trauma to the knee (eg, motor vehicle accident, knee dislocation). Initial imaging. Arteriography Lower Extremity Vascular injury may be found in about 30% of patients following posterior knee dislocation [56]. Injuries of the popliteal artery require prompt surgical intervention to help limb preservation. Associated peroneal and tibial nerve injuries may cause significant morbidity and require an understanding of their pathophysiologic implications to maximize limb functionality [57]. Angiography has been the reference standard in the evaluation of vascular injuries associated with knee dislocations [58]. However, this is an invasive procedure with associated risk, and with the excellent performance of CTA and MRA, it is usually performed in selected cases [58]. CT Knee CT is not routinely used as the initial imaging study for the evaluation of acute trauma to the knee. CT is superior to knee radiographs in detection and classification of fractures [12]; however, without IV contrast, CT cannot detect vascular injuries. CTA Lower Extremity With suspected vascular injuries in the setting of knee dislocation, CTA is frequently used because it is less invasive and has a similarly high accuracy as conventional angiography [58-60].