Floating Knee Workup

Updated: Nov 22, 2022
  • Author: Srinivasa Vidyadhara, MBBS, DNB, MS(Orth), DNB(Orth), FNB(SpineSurg), MNAMS; Chief Editor: Thomas M DeBerardino, MD, FAAOS, FAOA  more...
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Imaging Studies

Imaging modalities that may be helpful include plain radiography, magnetic resonance imaging (MRI), and computed tomography (CT).

Obtain anteroposterior (AP) and lateral radiographs of the femur and tibia, including views of the joint above and below. Order radiographs showing the pelvis and both hips. Obtain AP and lateral views of the affected knee.

MRI of the knee joint is advocated in patients with suspected injuries to the intra- or extra-articular ligaments. MRI findings may in help in planning management of ligamentous injuries.

CT scans of the metaphyseal fractures may be useful for understanding the three-dimensional configuration of the fracture fragments.

In addition, generalized radiologic screening of suspected skeletal injuries may be undertaken.

None of the investigations should hinder surgical management in emergency situations. In these circumstances, intraoperative examination under anesthesia after stabilization of the fractures may be more appropriate.