MR Findings of Traumatic Transient Lateral Dislocation of the Patellae.
10.3348/jkrs.2001.45.4.411
- Author:
Jean Hwa LEE
1
;
Hae Young SEOL
;
Sung Moon KIM
;
Joong Mo AHN
;
Myung Jin SHIN
Author Information
1. Department of Radiology, Asan Medical Center, College of Medicine, University of Ulsan. mjshin@www.amc.seoul.kr
- Publication Type:Original Article
- Keywords:
Knee, injuries;
Knee, MR;
Patella
- MeSH:
Anterior Cruciate Ligament;
Contusions;
Diagnosis;
Dislocations*;
Female;
Humans;
Joint Loose Bodies;
Joints;
Magnetic Resonance Imaging;
Male;
Patella*;
Patellar Ligament;
Retrospective Studies;
Soft Tissue Injuries
- From:Journal of the Korean Radiological Society
2001;45(4):411-415
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To determine the magnetic resonance (MR) imaging characteristics of traumatic transient lateral dislocation of the patellae. MATERIALS AND METHODS: In eight patients (6 males, 2 females, mean age: 22.4 years) in whom transient lateral dislocation of the patella was diagnosed, the distinctive MR imaging findings reflecting known injury mechanism were retrospectively analyzed with regard to bone contusion, chondral defect, fracture, loose body, joint effusion, and the associated soft tissue abnormalities. RESULTS: All of eight patients had bone contusions in the lateral femoral condyle and medial facet of the patella, while in five, chondral defects were present in this latter region. In three patients, fractures of the on lateral femoral condyle (n=2) and medial facet of the patella (n=3) were noted, and in three others, loose bodies were noted. Joint effusion [simple effusion (n=4), lipohemarthrosis (n=3)] was observed in seven patients, and associated soft tissue injuries [to the medial patellar retinaculum (n=8), patellar tendon (n=2), and anterior cruciate ligament (n=1)] in eight. Patellar subluxation was found in seven. CONCLUSION: MR imaging is a useful technique for the diagnosis of traumatic lateral dislocation of the patella. The significant MR findings are bone contusion in the lateral femoral condyle and medial facet of the patella, chondral defect, fracture, joint effusion, injury to the medial patellar retinaculum, and patellar subluxation.
