Extra-articular patellar dislocation with vertical axis rotation

Abstract Extra-articular vertical dislocation is very rare. It occurs when the patella is forced crossing the lateral femoral trochlear surface, and rotated simultaneously along its longitudinal axis at about 90°, resulting in a wedged dislocation against lateral condyle. Reduction has been reported...

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Bibliographic Details
Published in:The knee 2011-12, Vol.18 (6), p.512-513
Main Authors: Yang, Chen, Gong, Yubao, Wen, Xiaoyu, Liu, Jianguo, Qi, Xin
Format: Article
Language:English
Subjects:
Biomechanical Phenomena
Extra-articular
Fracture Fixation - methods
Humans
Male
Manipulation, Orthopedic - methods
Orthopedics
Patella - diagnostic imaging
Patella - injuries
Patella - physiopathology
Patellar Dislocation - pathology
Patellar Dislocation - physiopathology
Patellar Dislocation - therapy
Patellar dislocation firms
Radiography
Rotation
Treatment Outcome
Young Adult
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Summary:Abstract Extra-articular vertical dislocation is very rare. It occurs when the patella is forced crossing the lateral femoral trochlear surface, and rotated simultaneously along its longitudinal axis at about 90°, resulting in a wedged dislocation against lateral condyle. Reduction has been reported to require general anesthesia and an open procedure. We report a 19-year-old boy with extra-articular patellar dislocation, and a successful reduction was done by manipulation under local anesthesia. We believe that the mechanism of lateral vertical dislocation is the fulcrum mechanism.
ISSN:0968-0160
1873-5800
DOI:10.1016/j.knee.2010.11.003