Exam #2 - Hip Complex Flashcards
Function of Pelvis & Hip Complex
Transmits weight of the ____ ____ & ____. Supports organs involved with ____, ____, & ____
Transmits weight of the upper body & trunk. Supports organs involved with bowel, bladder & reproduction
Characteristics of Compact Bone
- Very dense & unyielding
- Withstands large loads
Characteristics of Cancellous Bone
- Relatively porous
- Relatively elastic
- Forms trabecular networks
Development of proximal femur is dependent of what? (4)
- Deferential growth of ossification centers
- Force of mm activation
- Force of weight bearing
- Circulation
Specific angulations that help define the femurs shape (2)
- Angle of inclination
- Torsional angle
Describes the angle within the frontal plane between the femoral neck & the medial side of the femoral shaft
Angle of inclination
Describes the relative rotation (twist) between the bones shaft & neck
Femoral Torsion
Top of thigh (femur) internally rotated causing an abnormal gait pattern called “in-toeing”
Excessive Anteversion
What is the orientation of the acetabulum in the frontal plane?
50-60° caudal-lateral
What is the orientation of the acetabulum in the horizontal plane?
20° anterior-lateral
What is the orientation of the acetabulum in the sagittal plane?
30° posteriorly rotated
- 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
“Center-Edge” Angle
- 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
Acetabular Anteversion
- Deepens the socket by 30%
- “Grips” the femoral head
- Helps maintain a (-) pressure
- Increases acetabular surface area
- Poorly vascularized
- Well supplied by afferent nerves
Acetabular Labrum
During walking, hip forces fluctuate from 13% of body weight during ____ phase to over 300% of body weight during ____ phase
During walking, hip forces fluctuate from 13% of body weight during mid-swing phase to over 300% of body weight during mid-stance phase
During the stance phase the lunate surface ____ slightly as the acetabular notch ____ slightly, thereby increasing the contact area as a means to reduce ____ ____
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
Pelvic rotation occurs in what plane of motion?
Horizontal plane
When standing on one limb, the weight bearing limb is reffered to as the
support hip
