Adjustable mechanical stability of the balanced tibiofemoral joint in flexion/extension: a novel measuring method in vitro

• Autorzy: Knosel, M. , Kubein-Meeesenburg, C. , Stuhmer, H. , Nagerl, H. , Mansour, M. , Fanghänel, J.
• Języki publikacji: EN

Abstrakty

EN

A number of muscles which pull over the tibiofemoral joint (possessing maximally four kinematic degrees of freedom) is larger than necessary in order to produce static equilibria in the physiologic positions of the tibiofemoral joint. Consequently, it should be possible to balance the knee in any arbitrary position by a set of combinations of isotonic muscular forces. The corresponding equilibria of the same flexional status should be differentiated by their degree of stability. Here, we describe a novel method which allows measuring the isotonic stability in flexion/extension in vitro for examining the above theses derived theoretically. By in vitro experiments we could show for the first time that not only a) the same position in flexion can be held in differing static equilibria by correspondingly differing combinations of muscular forces, but also b) the varying degree of stability ranges from stable and indifferent to unstable. These features were related a) to rotations of the resultant muscular force in the main functional plane and b) translations of its force line in parallel to this plane in the direction of abduction/adduction. By that we are able to present a hypothesis of how nature deals with an apparent antagonism of mechanically stable posture and mechanical instability of the joint demanded in the case of fast motion.

Słowa kluczowe

PL

biomechanika; wydłużenie; siła mięśniowa

EN

biomechanics; extension; muscular force; flexion

• Czasopismo: Acta of Bioengineering and Biomechanics
• Rocznik: 2004
• Tom: Vol. 6, nr 2
• Strony: 3-15
• Opis fizyczny: Bibliogr. 12. poz.,rys., tab.

Twórcy

autor

Knosel, M.

• ZMK Kieferorthopädische Ableilung d. Univ. Göttingen

autor

Kubein-Meeesenburg, C.

• ZMK Kieferorthopädische Ableilung d. Univ. Göttingen

autor

Stuhmer, H.

• ZMK Kieferorthopädische Ableilung d. Univ. Göttingen

autor

Nagerl, H.

• ZMK Kieferorthopädische Ableilung d. Univ. Göttingen

autor

Mansour, M.

• MPI für biophysikalische Chemie, Göttingen

autor

Fanghänel, J.

• Anatomisches Inst. D. Univ. Greifswald

Bibliografia

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