1. Joints in pelvis

2. Bony pelvis
Formed by
Sacrum, coccyx and pair of hip bones

3. Joints in pelvis

4. Pelvic outlet

5. Lumbosacral Joint Between vertebra L5 and the base of the sacrum
In between bodies
Intervertebral disc
Anterior and posterior longitudinal ligaments
In between the articular process
Inferior articular process of L5
and
Superior articular process of S1
Ligaments
Supraspinal, interspinal and ligamentum flava

6. Lumbosacral Joint In between bodies Intervertebral disc
Anterior and posterior longitudinal ligaments

7. Lumbosacral Joint - Zygapophyseal joints
In between the articular process
Inferior articular process of L5
and
Superior articular process of S1
Ligaments
Supraspinal, interspinal and ligamentum flava

8. Lumbosacral Joint Iliolumbar ligament From transverse process of L5
To inner lip of the posterior portion of the iliac crest
Limits the rotation of L5 on S1
Assists the articular processes in preventing L5 from moving anteriorly on S1

9. Applied anatomy Spondylolysis Spondylolisthesis
A defect allowing part of a vertebral arch to be separated from its body
Spondylolisthesis
Sliding of the body of the L5 vertebrae anteriorly on the sacrum

10. Sacro-iliac joint Compound joint Consists of
Anterior sacro-iliac joint
Synovial joint
Posterior sacro-iliac joint
Syndesmosis (fibrous joint)

11. Sacroiliac joint Bones Articular surfaces Tuberosities Sacrum Ilium
Auricular shaped surface of sacrum
Auricular shaped surface of ilium
Tuberosities

12. Hip bone - Sacropelvic surface
Iliac
tuberosity
Iliac tuberosity
Which gives attachment to interosseous sacroiliac ligament
Auricular surface for sacrum
To form sacroiliac joint
Pelvic surface
Form the wall of pelvic cavity
Auricular surface
(articulates with
Sacrum to form
Sacroiliac
joint)

13. Sacrum Sacral tuberosity Auricular surface Sacral tuberosity

14. Anterior sacro-iliac joint
Type
Synovial joint
Variety
Plane
Articular surfaces
Auricular surfaces
Limited mobility
Main role is
Transmitting the weight of the body to hip bones

15. Anterior sacroiliac joint
Articulating surfaces of sacroiliac joint differ
Iliac part - joint surfaces are covered by fibrocartilage
Sacral part - surfaces are covered by hyaline cartilage
Hyaline cartilage is 3-5 times thicker than the fibrocartilage (so, this joint belong to synovial)

16. Sacroiliac joint - Ligaments
Sacro iliac ligaments
Anterior sacroiliac ligament
Posterior sacroiliac ligament
Interosseous ligament

17. Posterior sacroiliac joint
Type
Fibrous
Variety
Syndesmosis
Articular surfaces
Tuberosities of sacrum and ilium
Ligament interosseous ligament
Posterior sacroiliac ligament

18. Anterior sacroiliac ligament
Anterior-inferior thickening of the fibrous capsule
Extends between
Anterior and inferior borders of iliac auricular surface
Anterior border of the sacral auricular surface

19. Interosseous sacroiliac ligament
Short ligament
Lies deep to posterior interosseous sacroiliac ligament
Attaches between
Lateral sacral crest
and
Iliac tuberosity

20. Posterior sacroiliac ligament
Very tough and strong ligament
Connects
PSIS with the lateral crest of the third and fourth segment of the sacrum

21. Sacro-iliac joint Relations Posterior Anterior
Erector spinae, Gluteus maximus
Anterior
Psoas major, iliacus
Obturator, femoral nerves and lumbosacral trunk
Bifurcation of common iliac artery
Formation of common iliac vein
ureter

22. Pubic symphysis
Secondary cartilaginous joint

23. Pubic symphysis Ligaments Superior pubic ligament
Connects superior aspects of the pubic bodies
Inferior pubic ligament

24. Sacrococcygeal Joint Type Bones Ligaments
Secondary cartilaginous joint
Bones
Sacrum & coccyx
Ligaments
Anterior, posterior and lateral sacrococcygeal ligaments