Lower limb viva prep Flashcards
What are the parts of the hip bone?
The ilium
The ischium
The pubis
What are the three articulations of the hip bone?
Sacroiliac joint - articulation with the sacrum
Pubic symphysis - articulation with corresponding hip bone
Hip joint - articulation with head of femur
What joins the three parts of the hip bone prior to puberty?
At what age do they begin and complete to fuse?
The triradiate cartilage
Begin to fuse at age 15-17
Completed at age 20-25
What are the bony landmarks of the ilium?
Anteriorly: iliac fossa on the wing of ilium (concave)
Iliac crest
ASIS (anterior superior iliac spine)
Anterior inferior iliac spine
Acetabulum
Posteriorly: gluteal surface of the wing of ilium (convex)
Posterior superior iliac spine
Which muscles attach to the ilium?
Gluteal muscles - attach to external surface of the ilium at the anterior, posterior and inferior gluteal lines
Iliacus muscle - attaches medically at iliac fossa
What is the clinical relevance of the ASIS?
Measure the true leg length from ASIS to medial malleolus
Discrepancy seen in hip disorders
How do you measure the true leg length?
From ASIS to medial malleolus
Discrepancy seen in various hip disorders
How do you measure the apparent leg length?
From the umbilicus to the medial malleolus
Where does the inguinal ligament attach?
From ASIS to pubic tubercle
What are the parts of the pubis?
Body (articulates at pubic symphysis) Superior rami (part of acetabulum) Inferior rami (part of ischiopubic ramus)
Two rami form part of the border of obturator foramen
What are the borders of the obturator foramen?
Inferior- ischiopubic rami (inferior ischial and pubic rami), part of body of ischium
Superior - superior ramus of pubis
Laterally - part of body of ischium, superior ischial ramus
Medial - body of pubis
What are the contents of the obturator foramen?
Obturator nerve
Obturator artery
Obturator vein
What are the parts of the ischium?
Body of the ischium Superior and inferior ischial rami Ischial spine Posteriorly: Greater sciatic notch Ischial tuberosity
What ligaments attach to the ischium?
Sacrospinous ligament: ischial spine to sacrum
Form greater sciatic notch - neurovasculature of lower limb incl sciatic nerve & piriformis muscle
Sacrotuberous ligament: ischial tuberosity -> sacrum forming lesser sciatic notch
How do fractures occur in the pelvic bone?
Direct trauma (vehicular accident) Forces transmitted form the lower limb (heavy fall on the feet)
Where do fractures occur on the pelvic bone?
Pubic rami
Acetabulum
Sacroiliac joint