Feasibility of Magnetic Resonance Imaging Monitoring of Postoperative Total Knee Arthroplasty without Metal Artifacts: A Preliminary Study of a Novel Implant Model

Figure 2

Four-week postoperative X-rays illustrating the location of the prosthesis with metal wires after total knee arthroplasty. The metal wires, shown as the high-density signal (the white arrows in (a)), were inserted in the components as the red part in the 3D sketch (the black arrows in (b)). According to the signals of the wires, the position of the tibial component, the spacer, and the femoral component can be roughly predicted. The normal prosthesis alignment position should be like the imaging in (a); however, the imaging in (c) indicated prosthesis component was dislocated or possibly got stuck. The tibia tray of PEEK prosthesis, showing low-density signal in the tibia (the yellow arrow), is cemented in the bone, and the bone cement showed slightly higher density signal than that of PEEK.

(a)

(b)

(c)