Problem scenario
You want to find a sport or buy shoes that incorporates your legs anthropometry. How do you find the ratio of your tibia's length to your femur's length?
Answer
Depending on your style of dress, personal trainers may not be able to guess your femur length. You do have to measure.
How do you measure the tibia (the bone between your ankle and knee) length?
See this: https://www.youtube.com/watch?v=5uKFNZF8O1o&feature=emb_rel_pause
How do you measure the femur (the bone between your knee and hip) length?
See this: https://www.youtube.com/watch?v=5uKFNZF8O1o&feature=emb_rel_pause
What is a typical ratio of tibia to femur?
The tibia is usually 80% of the femur's length (according to this external page). If the tibia is 100%, that is a long tibia (and good for sprinting according to Mark Rippetoe, https://startingstrength.com/training/shoes).
People with short femurs may want more of a heel for their weightlifting shoes (according to Mark Rippetoe, https://startingstrength.com/training/shoes). People with long femurs will may to avoid a high heel for their weightlifting shoes (according to Mark Rippetoe, https://startingstrength.com/training/shoes).
To read more, see this posting: https://allfamousbirthday.com/faqs/how-to-know-if-you-have-long-femurs/