Exam #2 - Hip Complex

Question 1

Function of Pelvis & Hip Complex

Transmits weight of the ____ ____ & ____. Supports organs involved with ____, ____, & ____

Answer 1

Transmits weight of the upper body & trunk. Supports organs involved with bowel, bladder & reproduction

Question 2

Characteristics of Compact Bone

Answer 2

• Very dense & unyielding
• Withstands large loads

Question 3

Characteristics of Cancellous Bone

Answer 3

• Relatively porous
• Relatively elastic
• Forms trabecular networks

Question 4

Development of proximal femur is dependent of what? (4)

Answer 4

1. Deferential growth of ossification centers
2. Force of mm activation
3. Force of weight bearing
4. Circulation

Question 5

Specific angulations that help define the femurs shape (2)

Answer 5

1. Angle of inclination
2. Torsional angle

Question 6

Describes the angle within the frontal plane between the femoral neck & the medial side of the femoral shaft

Answer 6

Angle of inclination

Question 7

Describes the relative rotation (twist) between the bones shaft & neck

Answer 7

Femoral Torsion

Question 8

Top of thigh (femur) internally rotated causing an abnormal gait pattern called “in-toeing”

Answer 8

Excessive Anteversion

Question 9

What is the orientation of the acetabulum in the frontal plane?

Answer 9

50-60° caudal-lateral

Question 10

What is the orientation of the acetabulum in the horizontal plane?

Answer 10

20° anterior-lateral

Question 11

What is the orientation of the acetabulum in the sagittal plane?

Answer 11

30° posteriorly rotated

Question 12

• Measures the fixed orientation of the acetabulum within the frontal plane, relative to the pelvis
• Measure defines how much the top of the femoral head is covered by the acetabulum

Answer 12

“Center-Edge” Angle

Question 13

• Measures the fixed orientation of the acetabulum within the horizontal plane, relative to pelvis
• Measures how much the front of femoral head is covered by the acetabulum

Answer 13

Acetabular Anteversion

Question 14

• Deepens the socket by 30%
• “Grips” the femoral head
• Helps maintain a (-) pressure
• Increases acetabular surface area
• Poorly vascularized
• Well supplied by afferent nerves

Answer 14

Acetabular Labrum

Question 15

During walking, hip forces fluctuate from 13% of body weight during ____ phase to over 300% of body weight during ____ phase

Answer 15

During walking, hip forces fluctuate from 13% of body weight during mid-swing phase to over 300% of body weight during mid-stance phase

Question 16

During the stance phase the lunate surface ____ slightly as the acetabular notch ____ slightly, thereby increasing the contact area as a means to reduce ____ ____

Answer 16

During the stance phase the lunate surface flattens slightly as the acetabular notch widens slightly, thereby increasing the contact area as a means to reduce peak pressure

Question 17

Pelvic rotation occurs in what plane of motion?

Answer 17

Horizontal plane

Question 18

When standing on one limb, the weight bearing limb is reffered to as the

Answer 18

support hip