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Fig. 7B —Snapping knee syndrome. Snapping knee with prosthesis.
Coronal sonogram of medial side of knee (oriented on its side) shows abnormal
movement of polyethylene component (hyperechoic line with ring-down artifact)
that is misaligned with adjacent tibia. Initially polyethylene component is
aligned with adjacent tibia. However, with knee flexion and extension, there
is abnormal movement of component (hyperechoic line with ring-down artifact).
For video, see supplemental Figure S7B.
