[Functional adaptation of the bones. Animal experiment studies on rats].
The authors wanted to study the effect of non-physiologic muscular forces on growing rat bones. 35 animals were submitted to a total extirpation of the femur, 40 animals served as control group. They were killed immediately, six, twelve, or 24 weeks later, respectively. The results determined by macroscopic X-ray and fluorescence microscope examination are identical. As opposed to the control tibiae, the tibiae exposed to a greater load showed an increased bone density, increased ventral and lateral annexes, above all within the proximal third, and a torsion apparent in the cross-section. The less loaded tibiae showed a smaller bone density, increased medial and lateral annexes, above all within the proximal third, and a torsion apparent in the cross-section. The results are explained by the varying action of pressure and muscular forces and compared to those achieved by other authors.
D000222:Adaptation, Physiological; D000818:Animals; D001842:Bone and Bones / Q000502:physiology*; D005269:Femur / Q000601:surgery; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013977:Tibia / Q000502:physiology / Q000601:surgery; D014945:Wound Healing
Funktionelle Adaptation der Knochen. Tierexperimentelle Studie an Ratten.