Transfemoral Biomechanics

Question 1

In the sagittal plane, the transfemoral socket is always aligned with:

Answer 1

5 degrees of flexion if the patient has zero degrees of extension and if there is a contracture, then the socket is pre-flexed to the measured degrees of the contracture plus five degrees of flexion.

Question 2

In a properly modified quadrilateral socket, the medial wall and brim are parallel to the line of progression. Although the posterior brim is perpendicular to the line of progression, the posterior is not.

Answer 2

True

Question 3

In the coronal plane, the classic reference point on the posterior quadrilateral socket at which to drop a plumb bob to determine inset or outset of the foot is:

Answer 3

located one inch lateral to the medial wall

Question 4

For shorter amputations, Radcliffe suggested that the foot be inset because of the drum cannot generate sufficient force to create mediolateral stability in the socket.

Answer 4

False

Question 5

As a transfemoral patient increases in cadence, the flexion resistance of the knee unit must decrease for smooth gait.

Answer 5

False

Question 6

For the shorter TF amputation, according to Radcliffe, the force (hip abduction) required to establish medial lateral stability in the socket decreases as the foot is outset.

Answer 6

True

Question 7

The initial sagittal plane location for a single axis constant friction knee is ___ to the TA line.

Answer 7

1/4” posterior

Question 8

A plumb line is required to verify the knee joint location with respect to the TA line.

Answer 8

False

Question 9

A softer soled shoe may allow the ground reaction line to project up from the ground more anteriorly as compared to that of the harder soled shoe.

Answer 9

True

Question 10

Voluntary stability of the knee joint can be created by generating a knee extension moment but contracting the hip extensors.

Answer 10

True

Question 11

When is voluntary control most important during the gait cycle?

Answer 11

Loading Response