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Case of the Week 509



What is the most likely diagnosis?

  • 62 year-old with increasing knee pain



Frontal View Left Knee-4 Years Apart

  1. Particle Disease
  2. Rheumatoid Arthritis
  3. Loosening
  4. Patellar Tendon Rupture
  5. Stress Shielding

Additional Images-None

 

Additional Images

 

 

None


Answer:

 

3. Loosening of Knee Prosthesis

 

More (Click Discussion Tab)

 

 

Loosening of Knee Prosthesis

General Considerations

  • Knee prostheses typically are metallic with a polyethylene coating that forms the joint
    • They may be cemented in pace or cementless
  • Alignment of the components is critical for stability
  • The condyles must articulate evenly with the polyethylene tibial plateau
  • The tibial component is most common to loosen
    • Femoral loosening more difficult to see because of overlapping metallic femoral prosthesis
  • The patellar component is most prone to complications

MORE . . .

 


.

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LearningRadiology.com
is an award-winning educational website aimed primarily at medical students and radiology residents-in-training, containing  lectures, handouts, images, Cases of the Week, archives of cases, quizzes, flashcards of differential diagnoses and “most commons” lists, primarily in the areas of chest, GI, GU cardiac, bone and neuroradiology.