Knee Arthroplasty

Normal and Abnormal Imaging Appearances

Thomas Learch, MD, Rasu Shrestha, MD, Amilcare Gentili, MD, Deborah Forrester, MD and Edward McPherson, MD

Newer joint replacement systems and surgical techniques combined with the aging US population have led to an increase in patients undergoing knee arthroplasty surgery. Baseline and follow-up imaging studies help in determining success or failure of joint replacement surgery and aid in identifying common complications. Radiologists following these patients need to be aware of the normal radiographic appearance of post-operative and follow-up studies, as well as complications that occur over the course of implant use. This presentation describes the normal and abnormal imaging appearances postoperatively and on follow-up studies, including alignment and positioning abnormalities, fracture, polyethylene liner wear and dislocation, osteolysis, loosening, and infection. Conventional radiography and multislice compute tomography studies will be demonstrated. Imaging of anti-biotic impregnated cement spacers used to treat infection as well as revision knee arthroplasty will also be presented.

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Table of Contents:

Materials

Fixation

Prosthesis Types

Radiography

Baseline:

Follow Up:

Malalignment

CT, MRI, US

Arthrography

References

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