Flashcards in Lumbar Pelvic_Sacrum Deck (144)
What are the 4 primary functions of the pelvis?
1. bear weight
2. transfer loads from axial skeleton to appendicular skeleton
3. stable, limited mobility --> more efficient transfer of loads
4. serves as strong attachment point for muscles
Prominent bony features is a feature of which gendered pelvis?
Narrow, heart shaped pelvic inlet is a feature of which gendered pelvis?
Narrow distance b/n ASIS and Ischial tuberosity is a feature of which gendered pelvis?
Laterally facing acetabulum is a feature of which gendered pelvis?
Narrow pubic arch (70˚) is a feature of which gendered pelvis?
Less prominent bony features (rounded) is a feature of which gendered pelvis?
Wide, oval pelvic inlet is a feature of which gendered pelvis?
Wide distance between ASIS and Ischial tuberosities is a feature of which gendered pelvis?
Anteriorly facing acetabulum is a feature of which gendered pelvis?
Wide pubic arch (90˚-100˚) is a feature of which gendered pelvis?
What are 3 implications of gender differences in pelvic structure:
1. different mechanics in gait (acetabulum orientation)
2. smaller base of support for males in sitting (@ ischial tub)
3. Different moment are, length-tension relationships for musculature
Males sit back on the _________ because they have closer _________________.
Females purch-up on the ______________
List the muscles involved in pelvic/lumbar/sacral support and function:
Obturator externus, piriformis, gluteus minimus, superior gemellus, inferior gemellus, obturator internus, quadratus femoris, gluteus medius, gluteus maximus, and iliotibial tract
Pelvis has large influence on the _________, _________ and ___________.
trunk, hip and knee
The muscle attachments help:
1. transmission of loads
2. position influences length/tension relationships of muscles
What are the primary muscles involved in maintaining a unilateral stance of the frontal plane?
• Right hip abductor (glut medius)
• Left lumbar erector spianae
In a right hip tilt the glut medius is responsible for ________________________________. The left lumbar erector spinae are responsible for ________________________.
acting on the pelvis to pull into right lateral tilt
acting on pelvis to pull into right lateral tilt
Describe the characteristics of force couples:
- parallel forces
- equal magnitude
- opposite directions
- separated by some distance
Lumbo pelvic rhythm =
coupled motion b/n pelvis and lumbar spine
What can the lumbopelvic rhythm increase?
overal trunk motion for function
In research, the lumbar angle to hip angle was calculated using ratios during 25% of ___________________ phase
@ 0-25% extension phase the L/Hip ratio =
@ 25-50% extension phase the L/Hip ratio =
@ 50-75% extension phase the L/Hip ratio =
@ 75-100% extension phase the L/Hip ratio =
>1 (L/H ratio) =