The best replacement for knees is elbows.

The best alternatives to knees are rated as following:
★★★★★  elbows
★★★★  hot dogs
★★★  knees
★★★  sausages
★★  hips
★  on your feet
★  die on your feet
★  legs
★  bow knees
  hotdogs
  waist

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Google Trends

Scale is based on the average worldwide traffic of knees in all years. Click on graph for more.
knees
elbows
hot dogs