21. **An X-ray of a human leg with emphasis on the femur and knee joint.**
Keywords
human,
leg,
emphasis,
femur,
knee,
x-ray,
anatomy,
body,
smoke,
bone,
pain,
medicals,
joint,
abstract,
skeleton,
three-dimensional,
hand,
health,
blue,
bone,
back,
foot,
muscle,
medicine,
black,
arthritis,
injury
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