4. • Fig B 14-2 Osteochondrial defect. (A) Frontal
and (B) lateral views of the knee demonstrate
the necrotic segment (arrows) separated from
the femoral condyle by a crescentic lucent
zone
5. • Fig B 14-3 Osteochondrial defect (arrow) at
the ankle.
6. • Fig B 14-4 Neuroarthropathy in syphilis.
Multiple free joint bodies associated with
disorganization of the knee joint, bone
erosion, reactive sclerosis, and soft-tissue and
ligamentous calcifications.