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1. Ch. 8 Warm-Up
1. What is another name for joints?
2. What are the 2 main functions of joints?
3. What do you think are the most common joint
injuries?

2. Ch. 8 Warm-Up
John bent over to pick up a dime. What was the
type of joint and the movement that occurred at:
a)his hip joint
b)at his knees, and
c)between his index finger and thumb?

3. Ch. 8 Warm-Up
1. Tony fell asleep in class, and when he woke
up, he let go with a big yawn. To his horror,
he couldn’t close his mouth – his lower jaw
was “stuck” open. What happened?
2. What is the cause of Lyme disease?
3. How you determine by looking at someone
suffering from arthritis has OA or RA?

4. JOINTS
Chapter 8

5. Joints (or articulationsarticulations)
 Where two or more bones meet
 Functions: movement, hold skeleton together
 Classified by structure (or function):
1. Fibrous (synarthroses): immovable joint
2. Cartilaginous (amphiarthroses): slightly movable
3. Synovial (diarthroses): freely movable

6. Fibrous Joints
 No movement
 Located:
 SuturesSutures: bones of skull held together by
connective tissue fibers
 Between teeth & jaws

8. Cartilaginous Joints
 Bones united by cartilage
 Located:
 Epiphyseal plates
 Rib & sternum
 Pubic symphysis

10. Synovial Joints
 Bones separated by fluid-containing joint cavity
 Synovial fluidSynovial fluid reduces friction between cartilages
 MenisciMenisci: fibrocartilage that partially divides a joint
cavity at knee, reduces friction
 BursaBursa: flattened sacs containing synovial fluid,
occur where bones, ligaments, tendons,
muscles, skin rub together

11. Lateral & Medial Meniscus

12. Torn medial meniscus

13. Bursa (fluid-filled sac that cushions
between bones & tendons/muscles

14. Types of Synovial Joints
1.1. PlanePlane – wrist
2.2. HingeHinge – elbow, ankle, fingers
3.3. PivotPivot – ulna/radius
4.4. CondyloidCondyloid (ellipsoidal) – wrist, knuckle
5.5. SaddleSaddle – thumb
6.6. Ball-and-socketBall-and-socket – shoulder, hip

15. Types of Synovial Joints

22. Types of Synovial Joints
Types of Synovial Joints

23. Joint Movement
 Every skeletal muscle
attached to bone or
connective tissue at 2+
points
 Origin: attached to
immovable (less movable)
bone
 Insertion: attached to
movable bone

24. Types of Synovial Joint
Movement
1. Gliding
2. Angular movements
3. Rotation

25. 1. Gliding
 Flat bone slips over another
 Back-forth, side to side
 Eg. Between vertebrae, wrist, ankle

26. 2. Angular Movement
 Increase or decrease angle between
bones
Types:
A. Flexion:  angle between bones (bend knee)
B. Extension:  angle along sagittal plane,
straighten limbs, (unbend knee)
C. Abduction: “moving away” from midline along
frontal plane (spread apart fingers)
D. Adduction: “move toward” midline (arm moving
in)

27. Flexion:  angle between bones

28. Extension:  angle along sagittal plane,
straighten limbs

29. Hyperextension

30. Abduction – Adduction -
Circumduction

31. 3. Rotation
 Turn bone along long
axis
 Eg. Hip, shoulder, swivel
head (C1/C2)

32. Special Movements
 Radius & Ulna:
 Supination: bones are
parallel, anatomical
position
Sup- = “soup bowl”
 Pronation: bones form
an X, relaxed position
Pro- = pro-basketball
player dribbles

33. Special Movements
 Elevation/Depression: and  (shrug,
chewing)

34. Special Movements
 Foot: inversion (medially)/eversion (laterally)

35. Special Movements
 Ankle: dorsiflexion (toes point up)/plantarflexion
(toes point down)

36. Special Movements
 Jaw: protraction (jut out)/retraction (bring back
in)

37. Special Movements
 Thumb: opposition (touch to other fingers on
hand)

38. Joint Disorders
 ArthritisArthritis (joint inflammation)
 OsteoarthritisOsteoarthritis:: wear-and-tear, degeneration
 Rheumatoid arthritis:Rheumatoid arthritis: chronic inflammation,
autoimmune
 GoutGout:: uric acid deposits in soft tissue of joints
 SprainSprain: ligaments stretched or torn
 DislocationDislocation: bones forced out of alignment
 BursitisBursitis: inflammation of bursa
 TendonitisTendonitis: inflammation of tendons (overuse)
 Lyme DiseaseLyme Disease: tick bite  joint pain, arthritis,
skin rash, flu-like symptoms

39. Robert Griffin III (RGIII)
 Repaired lateral collateral ligament (LCL)
 Reconstructed anterior cruciate ligament (ACL) 2nd
time

40. Common Knee Injury: Hockey Puck

41. YouTube Video: ACL Surgery
Knee Repair: ACL Surgery

42. Knee Replacements

43. Knee Replacement Surgery (Pre-Op Video)
Knee Replacement Surgery

44. Hip Joint

45. Hip Arthritis

46. Hip Replacements