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

Question

Quizplus · Accepted Answer

Weakness in the quadriceps femoris causes the inability to adequately support loads or control knee extension, therefore leading to forward lean of the trunk or hyperextension of the knee joint. Since this is a muscular weakness, strengthening the causative muscles can improve the gait abnormality.

Why Does Weakness in the Quadriceps Femoris Lead to Forward