Now, take the same knee and imagine you are looking from the frontal plane. Your
ID: 143656 • Letter: N
Question
Now, take the same knee and imagine you are looking from the frontal plane. Your knee could be neutrally aligned, or it could have varus or valgus alignment (shown here, somewhat exaggerated).
The knee alignment will shift the distribution of forces between the medial and lateral condyles. Assume that even in the most mal-aligned knees, a maximum of 70% of the total force would be transmitted through one condyle or another, what is the possible range of medial vs lateral force distributions, given your total joint reaction force? How would this affect the average compressive stress within the medial and lateral compartments of the tibia?
Explanation / Answer
knee joint consists of two condylar joints between median and lateral of femur and the condylar of tibia and a gliding joint. knee joint has six degree of freedom 3 rotations and 3 translations. during rotation of knee joint the flexion extension is upto 160 deg and 6 to 8 deg of extension in varus or valgus alignment where as in internal and external rotation there is a 25 to 30 deg of flexion.(during translation the knee joint flexes upto 5 to 10 mm posterior, 2 to 5 mm of compression and medio -lateral of1 to 2 mm)
In a screw home rotation(Prolonged anterior glide on the medial side produces external tibial rotation called screw-home mechanism) at 20 deg knee extension anterior tibial glides on the tibia's medial condyle as its articular surface is longer in that dimension than the lateral condyle's .
patella is a bone that acts as a pully changes the direction of applied force by helping the quadricep muscles during contraction
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