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Age / Sex : /
Age / Sex : 23 / F
Chief complaint : Lt. Knee pain after stretching
1) What is your impression?
Two weeks later, you can see the final diagnosis with a brief discussion of this case.
* Send Application Answers to Ja-Young Choi, MD (drchoi01@radiol.snu.ac.kr)
Courtesy : Ik Yang, MD. Department of Radiology, Kangnnam Sacredheart Hospital, Hallym University
Diagnosis: transient patella dislocation
Discussion
Findings:
1. BM edema
2. Lat. Subluxation of patella
3. Torn .med. Retinaculum
4. Prepatellar bursal hemorrhage or fluid
Differential Diagnosis:
• Hemarthrosis 일으키는 질환
- Trauma Ligament or meniscus injury
- Bone or cartilage injury
- PVNS
- Hemophilia, bleeding disorder
- Intraarticular tumor(synovial hemangioma
Discussion:
- Dislocation of the patella laterally as the result of twisting injury with valgus stress or as the result of direct trauma.
- Imaging findings ; bone contusions of the anterior lateral femoral condyle and medial patella are diagnostic. Patella often spontaneously reduces into trochlear groove with extension following the injury.
References:
Transient lateral patellar dislocation; diagnosis with MR imaging. AJR 1993;161;109-113 Diagnostic imaging Orthopaedics, Stikker and Tirman.
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