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Related Experiment Videos

MR imaging of patellar dislocation and relocation.

T L Pope1

  • 1Department of Radiology, Medical University of South Carolina, Charleston 29425, USA. popetl@musc.edu

Seminars in Ultrasound, CT, and MR
|August 22, 2001
PubMed
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Patellar dislocation and relocation (PDR) often results from knee trauma. Prompt diagnosis via imaging and surgical repair are crucial to prevent recurrent dislocations and associated injuries.

Area of Science:

  • Orthopedics
  • Radiology
  • Sports Medicine

Background:

  • Patellar dislocation and relocation (PDR) is a common knee injury, often sudden, linked to trauma or torsional stress.
  • Clinical examination post-PDR is challenging due to knee swelling.
  • Radiographs may reveal hemarthrosis or patellar chip fractures.

Purpose of the Study:

  • To review predisposing factors, activities, and clinical, radiographic, and MR imaging features of PDR.
  • To briefly discuss therapeutic options for PDR.

Main Methods:

  • Review of clinical, radiographic, and magnetic resonance (MR) imaging findings in PDR.
  • Analysis of factors contributing to PDR and associated injuries.

Main Results:

Related Experiment Videos

  • MR imaging reveals medial retinaculum disruption, lateral patellar tilt, femoral/patellar bone contusions, osteochondral injury, fat pad damage, and joint effusion.
  • Up to one-third of patients have concomitant ligament or meniscal injuries.
  • Over 50% of patients experience redislocation without primary injury repair.

Conclusions:

  • PDR involves characteristic imaging findings and frequently co-occurs with other knee injuries.
  • High redislocation rates necessitate consideration of surgical intervention for PDR.