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📌 Pathogenesis of Osteochondritis Dissecans
✅ Osteochondritis Dissecans
- The disturbed segment, known as "a progeny," may develop laminar calcifications or ossify partially/completely.
- Detachment starts at the deep, basal portion of the lesion, creating a cleft and causing fragment instability.
- This instability disrupts the bone plate and overlying articular cartilage, leading to fragment separation.
✅ Disturbance of Epiphyseal Growth Plate
- An unknown insult disturbs a small area of the epiphyseal growth plate.
- This leads to localized delay or cessation of normal ossification.
- The affected segment remains cartilaginous while the rest of the epiphysis continues to ossify.
- A radiolucent crater forms in the area of hindered cartilage ossification.
✅ Chronic Osteochondral Lesion
- Osteochondritis dissecans is a chronic lesion occurring in young adults and children.
- It involves progressive separation of articular cartilage and underlying subchondral bone.
- The cleavage plane is situated in the subchondral bone, eventually affecting the full thickness of the overlying articular cartilage.
References
- RadioGraphics 2018; 38:1478–1495
- J Clin Orthop Trauma. 2021 Sep 25;22:101610
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#OsteochondritisDissecans, #EpiphysealGrowthPlate, #Ossification, #RadiolucentCrater, #LaminarCalcifications, #ArticularCartilage, #SubchondralBone, #ChronicLesion, #FragmentInstability, #Orthopedics
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