Autori: Spanu, C., Hefzy, M.S.,

Editorial: 2001 Summer Bioengineering Conference, section Joint Mechanics I, June 27- July 1, Snowbird, Utah, USA, 2001.

Rezumat:

Scopul lucrarii este sa determine rolul ligamentelor cruciate in timpul flexarii genunchiului pina la 150 grade.
Un model matematico-anatomic bi-dimensional a fost dezvoltat. Simularea a fost condusa pentru simularea contractiilor isometrice ale quadricepsului asociate cu co-contractia hamstring-ului (scuze, nu cunosc traducerea in lb. romana) pentru diferite pozitii in timpul flexarii genunchiului.
FIbrele anterioare si posterioare ale ligamentului cruciat posterior sunt incarcate cind genunchiul este flexat total. Fibrele posterioare ale ligamentului cruciat anterior sunt incarcate numai in prima faza de flexare pina le 36 grade,sunt neincarcate in regiunea 36-100 grade de flexiune, ca apoi sa fie din nou incarcate catre flexare totala.
Aceste rezultate subliniaza rolul deosebit al ambelor ligamente cruciate pentru aceasta pozitie. The objective of the present work is to determine the role of the cruciate ligaments during deep squat while the knee is maximally flexed, up to 150 degrees of knee flexion. A two-dimensional anatomically based mathematical model of the human knee joint was developed for this purpose. Model calculations were conducted to simulate isometric quad contractions associated with hamstrings co-contractions at different positions during squat.
Both anterior and posterior fiber bundles of the posterior cruciate ligament were found to carry high loads when the knee is maximally flexed. The posterior fiber bundles of the anterior cruciate ligament were found to carry forces in the first 36 degrees of knee flexion, to become unloaded in the range of 36 to 100 degrees of knee flexion, then to carry forces as the knee went into deep flexion, reaching a maximum value when the knee was fully flexed. These results point to the important role of both cruciate ligaments in this position.

Cuvinte cheie: genunchi, ligamentele cruciate, flexare totala, proteza de genunchi // knee, cruciate ligaments, deep flexion, total knee replacement

URL: http://asme.pinetec.com/bio2001/data/tocs/jm1.html