Why Does Weakness in the Quadriceps Femoris Lead to Forward

Why does weakness in the quadriceps femoris lead to forward lean of the trunk or hyperextension of the knee joint?

A) The heel tends to slap down on the ground during initial contact
B) Causes inability to adequately support loads or control knee extension
C) Leads to instability of the patella and spasm of the surrounding tendons which cause postural misalignment
D) Resulting excessive flexion in the knee and hip lead to this postural misalignment

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