Pelvis (sacrum + coccyx) anatomy

Question 1

Joints

Answer 1

Sacro-iliac (Plane Synovial) Joint
Sacrococcygeal (Symphysis) Joint
Pubic Symphysis

Question 2

Ligaments at Sacro-iliac Joint

Answer 2

1. Sacro-iliac - Sacrum to ilium, consists of posterior (strong), anterior (provides rotational stability), and interosseous (strongest) ligaments

Question 3

Ligaments at Sacrococcygeal Joint

Answer 3

1. Sacrococcygeal - Between coccyx and sacrum consists of anterior, posterior, and lateral ligaments; contains an IV disc between S5 and C1

Question 4

Pubic Symphysis

Answer 4

1. Pubic – between pubic bones

Question 5

Accessory ligaments

Answer 5

Help stabilise the lumbosacral spine on the pelvis.
1. Sacrotuberous ligament - Iliac spines and sacrum to ischial tuberosity
2. Sacrospinous ligament – Ischial spine to sacrum and coccyx.