How much difference between the humerus and femur is considered normal?
May 10, 2023
Source: Cainiu Health
Dr. Lin Yunfei
Introduction
The difference in length between the humerus and femur, based on fetal development analysis, is generally considered normal if it ranges from 0 to 10 mm. Color ultrasound examinations can typically be performed during periods of greater discrepancy throughout pregnancy. For example, at 11 weeks of gestation, both the humerus and femur are usually around 8 mm in length, resulting in a difference of 0 mm. By 39 weeks of gestation, the humerus measures approximately 65 mm and the femur approximately 75 mm, resulting in a difference of about 10 mm.
The difference in length between the humerus and femur can be analyzed during the fetal period, with a normal difference typically ranging from 0 to 10 mm. The detailed analysis is as follows:
The humerus is the largest bone in the upper limb and one of the longest tubular bones in the human body. To measure their lengths, color ultrasound examinations are usually performed at different stages throughout pregnancy. For example, at around 11 weeks of gestation, both the humerus and femur are approximately 8 mm long, resulting in no difference (0 mm). By about 39 weeks of gestation, the fetal humerus measures approximately 65 mm in length, while the femur measures approximately 75 mm, resulting in a difference of about 10 mm. Therefore, under normal circumstances, the difference between the humerus and femur lengths generally ranges from 0 to 10 mm.
The difference in length between the humerus and femur is normal, as these bones are located in different parts of the body, and the specific difference depends on the individual's height and body build.
