1. When performing knee flexion with a relatively fixed tibia, what direction do
ID: 89076 • Letter: 1
Question
1. When performing knee flexion with a relatively fixed tibia, what direction does the femur roll and glide within the tibiofemoral joint?
A. Identify the bone that makes up the convex surface of the joint.
B. Identify the bone that makes up the concave surface of the joint.
C. Select the appropriate rule to apply and provide a brief description as to why you made your selection.
D. Identify the direction the femur is rolling and provide a brief explanation as to how you came to this answer.
E. Identify the direction the femur is gliding and provide a brief explanation as to how you came to this answer.
Explanation / Answer
# The initiation of knee flexion occurs primarily as rolling of the femoral condyles on the tibia that bring the contact of the tibial condyles.As flexion continues,the rolling of the femoral condyles is accompained by a simultaneous anterior glide that is just sufficient to create nearly pure spin of the femur on the posterior tibia with little linear displacement of the femur condyles.
# The Knee also known as the tibiofemoral joint is a synovial Hinge joint found between three bones:the femur,tibia and patella.Two rounded,convex processess(known as condyles)on the distal end of the femur meet two rounded,concave condyles at the proximal end of the tibia.
In Tibiofemoral articulation concave tibial plateaus articulate on the convex femoral condyles.
# During knee extension,the femoral condyles roll anteriorly on the tobial plateau until the" rigid" PCL checks further anterior progression of the femur,creating a posterior transtational force on the femoral condyles.
# The anterior glide of the Femur during flexion is further faciliated by the shape of the menisci.The wedge shape of the menisci posteriorly forces the femoral condyle to roll "uphill" as the knee flexes.The oblique contact force of the menisci of the femur helps guide the femur anteriorly during flexion while the reaction force of the femur on the menisci deforms the menisci posteriorly on the tibial plateau.
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