Femur Length Measurement 

Hi Ramus. For a skilled anthropometrist, taking two measurements and using the mean for further calculations is standard practice. However; it is recommended that an inexperienced measurer take triplicate measurements and use the median value. A summary of the article (Carter, J.E.L. & Heath, B.H. 1990) referenced in this demonstration can be found here: www.somatotype.org/Heath-CarterManual.pdf Good catch!

Great question! The key is consistency and while measuring to the ASIS seems smart, the problem is that you would be unable to compare the measurement to any standardized norm table since measuring to the greater trochanter is common practice in the scientific community. Additionally, it is very likely that you want WANT to account for a femur length discrepancy since this affects gait biomechanics. Also, you want to avoid measuring across a diarthrotic joint because a change in posture would change the length. It just makes more room for error. Finally, measuring to the ASIS would mean we would have to re-name the measurement! Thanks for your comment!

My femurs are shorter than my tibias. My femurs aren’t short my tibias are just very long, a X-ray shows otherwise.

@@silverninja3570 you need special x ray marker measurement to exactly know your femur length, and I'm 100% sure your femurs are ar least 1cm to 2cm longer than your tibia. Just for you to know: If the average tibia/fem ratio is 0.80 with a standard deviation of 0.03, then 3 standard deviations up would be 0.89 (tibia shorter than femur), which would be the top 0.15% (99.7% is 3 standard deviations coverage centered at 0.80), and 4 standard deviations up would be 0.92 (tibia still shorter than femur), which would be the top 0.0005% (99.99% is 3 standard deviations coverage centered at 0.80), and 5 standard deviations up would be 0.95 (again, tibia still shorter than femur), which would be the top 0.00003% (99.99994%% is 3 standard deviations coverage centered at 0.80), which at this point is the 5-sigma threshold for scientific observations to become a discovery. At this point it is 1 in 3.5 million people who have a 0.95 tibia to femur ratio, and the tibia is STILL shorter than the femur. The 6th standard deviation above the mean would be an astronomical number, and even then it is still not more than 1, it is 0.98. You'd need to hit the 7th standard deviation which would be much much much higher than 1 in 3.5 million to achieve a ratio of greater than 1, which would mean the tibia is longer than the femur. For all purposes and intent, a longer tibia than femur is not natural and doesn't occur in more than 99.9999% of normal humans.

​@@peppesgabello Maybe he is among the approximately 8000 people who have longer tibia than femur?

Reference is in the description!

Haha.

Hi 17teacmrocks. It's important to reference anatomical landmarks when taking body measurements. 'Pelvic region' is rather unspecific and I can assure you that the landmarks used in this video are consistent with those recommended by Carter, J.E.L. & Heath, B.H. (1990). The femur makes up the entire length of your thigh, from knee to hip. The head of the femur articulates with the acetabulum (hip socket) which is actually several centimetres ABOVE greater trochanter used in this demonstration. I hope this helps!

They say tibia is shorter than femur but i think this guy has shorter femur compared to tibia

@@shresthtyagi5634 My femur are short too. It's not accurate to say femur are longest bone

femurs are 22% to 18% longer than tibias, so ideally 20% longer.Tibia/femur ratio of 0.8 should be ideal, but even a long femur like 0.75/73 it's still likeable because you will have long legs, just a disadvantage in some exercises like squats for example

Man my femur is 17 inches And the length of my tibia is 15inches-2cm but my own height is 5.9 inches.

The height of this boy is 6 feet 2 inches

​@@Deep_rattu Doubt he's that tall. 5'10 would be my guess

No, not at all. My tibiae are long af, but my femurs are still 10% longer. Must've been a wrong measurement

%26 of your height for males.

Mine is 28% of my height

MAGDALENA TAMBUNAN It is called an anthropometer or or simply sliding callipers.

@@measurementevaluationtechn8926 Thank you for the response