Joints in Pelvis

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
• 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
• Sacrum
• Ilium
• Articular surfaces
• Auricular shaped
surface of sacrum
• Auricular shaped
surface of ilium
• Tuberosities

12. Hip bone - Sacropelvic surface
• 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)
Iliac
tuberosity

13. Sacrum
• Sacral tuberosity
• Auricular surface 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
• 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
• Secondary cartilaginous joint
• Bones
• Sacrum & coccyx
• Ligaments
• Anterior, posterior and lateral
sacrococcygeal ligaments