(Fig 5-B.27) Types of Ossification Variants of the Knee

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📌 Ossification Variants of the Knee

 

✅ Variants of Normal Ossification

• Differentiating osteochondritis dissecans (OCD) from variants of normal ossification can be challenging. 
• However, the presence of intact overlying cartilage and a lack of underlying changes in marrow signal intensity favor a normal ossification variant over OCD.
• The absence of bone marrow edema, morphology, location of the lesion, and the patient's age are crucial in distinguishing a developmental variant of ossification from OCD.

• A continuous secondary physis overlying a region of osseous irregularity, with a lack of physeal disruption and adjacent subchondral bone marrow edema pattern, suggests a variation in normal development.

 

✅ Types of Ossification Variants of the Knee

First Case: Puzzle piece completely filled with bone.

• Characteristics: Continuous secondary physis overlying the region of osseous irregularity, lack of adjacent subchondral bone marrow edema pattern.

 

Second Case: Spiculated configuration with an irregular subchondral bone plate.

• Characteristics: Irregular and spiculated ossification.

 

Third Case: Additional ossification centers located within the unossified physeal cartilage.

• Characteristics: Extra ossification centers located within the non-ossified physeal cartilage, separated from the ossified portion of the femoral condyle.

 

References

• AJR 2019; 213:963–982
• RadioGraphics 2018; 38:1478–1495

 

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#KneeOssification, #Radiology, #Musculoskeletal, #OssificationVariants, #OCD, #MedicalImaging, #BoneHealth, #MRI, #Orthopedics, #DevelopmentalVariant