Battered Child Syndrome — Multiple Fractures of Varying Ages

A 7-month-old infant is brought to the emergency department with a history of refusal to use the left arm. The mother provides an inconsistent story, first stating the child "fell off the sofa," then changing it to being "rolled on by an older sibling." On examination, the child shows frozen watchfulness, healing bruises on the torso and buttocks, and a healing torn frenulum. A skeletal survey reveals multiple bilateral posterior rib fractures at varying stages of healing, a spiral fracture of the left humeral shaft, and the lesions marked **B** at the distal femora bilaterally. The child is admitted under child protection protocols. Which of the following best describes the radiographic significance of the lesions marked **B** in the context of non-accidental injury?