[A clinical observation as example and proof of functional adaptation of bone through longitudinal growth].

The history of the case and findings and follow-up in radiographs when submitted to analysis of the mechanical forces, are an example and proof for : 1. the fact that, in compression forces overlayed by flexion forces, the tension on the pressure aspect of flexion is always larger than on the extension side, since on the flexion side it is the sun of, on the extension side the difference between, the two tensions which are active. 2. Ossification and bone absorption are steered by the amount of tension and will be the greater, the more the tensions exceed or fall short of the "required" tensions which maintain the balance between ossification and bone absorption during the continuous restructuring of bone. 3. In epiphyseal cartilage which physiologically is purely subject to pressure, longitudinal growth will increase when flexion forces overlay on the pressure side where tensions are greatest. This will automatically exclude the overlaying flexion forces.