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osteochondritis dissecans (OCD)
Etiology:
- uncertain
- repetitive microtrauma & vascular factor(s) may contribute
Epidemiology:
- disease is more common in active young individuals
Pathology:
- bone disorder
- produces joint symptoms because of the intra-articular location of the abnormality
- most joints are affected, particularly
a) knee (distal femur)
b) ankle (dome of talus)
c) elbow (capitellum)
- in the knee, typically involves the medial aspect of the lateral condyle
Radiology:
- seen on radiograph as a semicircular focus of bone & overlying cartilage separated from the convex articular surface of the native bone by a lucency
- magnetic resonance imaging (MRI) is best for staging, to predict whether a fragment may become separated entirely, & establish a plan definitive treatment
General
osteochondritis
References
- Basic Radiology, Chen MYM, Pope TL & Ott DJ (eds),
McGraw Hill, NY 1996