Quadrilateral Socket Design Principles

Question 1

The primary factor in maintaining the femur in a proper adducted position in the transfemoral quadrilateral prosthetic socket

Answer 1

A properly contoured lateral wall.

Question 2

The design of a quadrilateral prosthetic socket is crucial because it provides a stabilizing interface by which the residual limb is contained, supported, and allowed to react against during the dynamic phase of gait.

Answer 2

True

Question 3

In a quadrilateral transfemoral socket, proper contouring of the socket walls is important because these contours:

Answer 3

• allow for dynamic changes in muscle shape during the course of the gait cycle
• provides a stabilizing force for the remaining skeletal structure
• provide mediolateral stability during stance phase on the prosthetic side
• provide total contact thereby increasing proprioception

Question 4

In the quadrilateral socket the function of the anterior wall is to maintain even pressure over the anterior residual limb and maintain the proper positioning of the ischial tuberosity on the posterior brim.

Answer 4

True

Question 5

Primary weight bearing in the quadrilateral transfemoral socket is provided by the ischial tuberosity and gluteus maximus.

Answer 5

True

Question 6

According to Frank Gottschalk, this has the greatest influence on the position of the femur in the socket.

Answer 6

Proper adductor muscle length and tension

Question 7

The posterior wall is perpindicular to the line of progression.

Answer 7

True

Question 8

The medial wall is parallel to the line of progression

Answer 8

True

Question 9

The patient may experience numbness in the residuum due to the scarpa’s bulge being too prominent.

Answer 9

True

Question 10

Pain at the lateral distal socket can be caused by a large M-L dimension of the socket.

Answer 10

True

Question 11

The Scarpa’s triangle is bounded by:

Answer 11

• Sartorius
• Adductor Longus
• Inguinal Ligament