📝 Practice MCQs
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🎙️ Frequently Asked Viva Questions
Q1. Why does the acetabulum face laterally, downward, and forward?
Answer: This orientation provides optimal stability while transmitting body weight from the pelvis to the femoral head during standing and walking.
Q2. Why is the posterior iliac crest the preferred site for bone marrow aspiration and donation?
Answer: It contains abundant red marrow and is easily accessible with minimal risk of injury to major vessels or viscera.
Q3. Why is the auricular surface of the ilium covered by fibrocartilage instead of hyaline cartilage?
Answer: Fibrocartilage better withstands the heavy compressive and shearing forces transmitted across the sacroiliac joint.
Q4. Why is the preauricular sulcus more prominent in females than in males?
Answer: It reflects adaptations of the female pelvis related to pregnancy and childbirth and is useful in sex determination.
Q5. Why is the acetabular labrum essential for normal hip joint function?
Answer: It deepens the acetabulum, increases stability, and improves congruity between the femoral head and acetabulum.
Q6. What is the anatomical importance of the triradiate cartilage?
Answer: It is the Y-shaped growth cartilage where the ilium, ischium, and pubis meet before fusion at the acetabulum.
Q7. Why is the ischial tuberosity called the “sit bone”?
Answer: Its inferomedial part bears the body’s weight in the sitting position through an overlying fibrofatty pad.
Q8. Which structures cross the posterior surface of the ischial spine, and why is this clinically important?
Answer: Pudendal nerve, internal pudendal vessels, and nerve to obturator internus (PIN); important during pudendal nerve block and pelvic surgery.
Q9. Why is the pubis often absent in prenatal skeletal remains?
Answer: The pubis ossifies later than the ilium and ischium, making it less likely to be present in fetal skeletons.
Q10. Why is the Risser sign clinically important in orthopedics?
Answer: It assesses skeletal maturity from iliac crest ossification and helps determine treatment timing in adolescent spinal deformities.
Q11. Why is the anterior inferior iliac spine prone to avulsion fractures in adolescent athletes?
Answer: Sudden forceful contraction of the rectus femoris can avulse the unfused apophysis before skeletal maturity.