Lecture 1: Pelvic and Perineal Osteology and Arthrology Flashcards
What does the pelvic brim separate?
- The greater (false) pelvis (superior) from the lesser (true) pelvis (inferior)
What is L5 spondylolisthesis?
Abnormal anteriorly directed separation of the L5 vertebral segment from the Sacrum.
What is L5 Spondylolysis?
Separation of the vertebral arch from the vertebral body
What is the Interpubic disc?
Fibrocartilagionous disc between right and left pubic symphyseal surfaces
Which ligaments create the greater and lesser sciatic foramina; what are their function?
Greater = Sacrospinous lig
Lesser = Sacrotuberous lig
- Prevent rotation of the sacrum/coccyx
What makes up the superior and inferior pelvic aperature; what is found passing between them?
Superior = pelvic inlet; exists at the pelvic brim between the greater and lesser pelves
Inferior = pelvic outlet
*Pelvic canal is the passage between the 2 Aperatures
Anteroposterior compression of the pelvis produces what type of fractures?
Both the superior and inferior pubic rami
Lateral forces/compression will lead to what kind of fractures?
- Squeezes the acetabulum and ilia together breaking both
- Head of femur will be forced through the acetabulum
What are the 4 weak areas of the pelvis?
1) Pubic rami
2) Acetabulum
3) Sacroiliac joints
4) Ala
The lesser or true pelvis is the area defined by what superiorly, inferiorly, laterally/anteriorly, and posteriorly?
Superiorly: pelvic brim (pelvic inlet)
Inferiorly: muscular pelvic diaphragm
Laterally/anteriorly: lower 1/2 of the hip bones (ilium, ischium, pubis)
Posteriorly: sacrum and the coccyx
What is found in the Greater (false) pelvis?
Occupied by abdominal viscera (cecum, sigmoid colon, etc..)
What is the normal male type of pelvis; what is the pelvic outlet, pubic arch/subpubic angle, obturator foramen, acetabulum and greater sciatic notch?
- Android pelvis
Pelvic outlet: small
Pubic arch/subpubic angle: narrow (<70°)
Obturator foramen: Round
Acetabulum: Large
Greater Sciatic notch: Narrow (70°); inverted V
What is the normal female type of pelvis; what is the pelvic outlet, pubic arch/subpubic angle, obturator foramen, acetabulum and greater sciatic notch?
- Gynecoid pelvis
Pelvic outlet: comparitively large
Pubic arch/subpubic angle: Wide (>80°)
Obturator formaen: Oval
Acetabulum: Small
Greater sciatic notch: Almost 90°
What sex does this pelvis belong to and how do you know?
- Female
- Sacrum is wider, shorter, sacral curvature is accentuated
- Coccyx is more moveable; straighter
- Greater sciatic notch is wide and shallow
What sex does this pelvis belong to and how do you know?
- Male
- Sacrum is narrow; longer; sacral promontory more ventral
- Coccyx is less moveable; curves ventrally
- Greater sciatic notch is narrow and deep
What are each of these pelvis types, A-D?
Label A-C
A) Transverse Acetabular L
B) Obturator canal
C) Obturator membrane
Label the arrows from top to bottom
- Posterior Longitudinal L.
- Anterior Longitudinal L.
- Ligamentum flavum
- Anterior Sacroiliac L.
- Sacrospinous L
- Ischial spine
- Sacrotuberous L.
- Anterior sacrococcygeal L.
- Posterior sacrococcygeal L.