The answer is 2 weeks or greater.
All long bones should be measured if the difference between the femur length and all other biometric parameters is 2 weeks or greater.
How are long bones measured?
- The most trustworthy method for getting precise measurements of the length of long bones, particularly length variations between the two sides, is radiography.
- Although investigations of the upper limbs are occasionally performed, radiography is mostly used on the lower limbs.
- Calipers are portable instruments used for taking exact measurements of the skeleton, teeth, and skull. Depending on the measures being obtained, many formats are available.
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