Abstract
MRI confirms a patellar sleeve fracture with laminar tearing of the extensor mechanism (Fig. 2, arrows). A patellar sleeve fracture is an uncommon cartilaginous avulsion resulting from hyperextension of the knee. Often identified as a distal pole avulsion, these represent a disengagement of the bone-forming physeal cartilage and associated zone of provisional calcification in addition to the overlying epiphyseal cartilage [1]. Radiographs might underestimate the degree of injury. MRI shows the full extent of soft-tissue and cartilaginous injury. Management can be conservative or surgical depending on injury severity [2].
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