Download General Arthrology

INTRODUCTION OF
GENERAL ARTHROLOGY
By:
Dr. RAKESH KUMAR DIWAN
ASSISTANT PROFESSOR
DEPARTMENT OF ANATOMY
KGMU UP LUCKNOW
•
DEFINITION- ARTHROLOGY IS THE
SCIENTIFIC STUDY OF JOINTS , AND
ARTICULATIONS.
• SITE WHERE RIGID ELEMEMTS OF
THE SKELETON MEET ARE CALLED
ARTICULATIONS.
CLASSIFICATION OF JOINTS:
A)
CLASSIFICATION
BASED
ON
STRUCTURE
B)
CLASSIFICATION
BASED
ON
FUNCTION
CLASSIFICATION BASED ON
STRUCTURE
BASED ON THE MATERIAL THAT BINDS THE BONES
TOGETHER, AND ON THE PRESENCE OR ABSENCE OF
JOINT CAVITY.
A) FIBROUS JOINTS
B) CARTILAGINOUS JOINTS
C) SYNOVIAL JOINTS
FIBROUS JOINTS-BONES CONNECTED BY FIBROUS TISSUE
-no joint cavity
a) Sutures
b) Syndesmoses
c) Gomphoses
CARTILAGINOUS JOINTS- THE BONES ARE UNITED BY
CARTILAGE
- THERE IS NO JOINT CAVITY
a) Synchondrosis( hyaline cartilage
unites the bones)
b) Symphyses( fibrocartilage unites the
bones)
SYNOVIAL JOINTS-MOST MOVABLE JOINTS IN THE BODY
-THERE IS A JOINT CAVITY.( SYNOVIAL
CAVITY, SYNOVIAL FLUID)
-ARTICULAR CARTILAGE( COVERS THE
ENDS OF THE OPPOSING BONES)
-ARTICULAR CAPSULE( IT ENCLSES
THE JOINT CAVITY.2 LAYERED)
-REINFORCING LIGAMENTS
-BURSAE
-MOVEMENT VS STABILITY
CLASSIFICATION BASED ON
THE BASIS FUNCTION
• SYNARTHROSES-IMMOVABLE JOINTS (sutures)
• AMPHIARTHROSES- SLIGHTLY MOVABLE JOINTS(
FIBROUS CONNECTION)( intervetebral discs)
• DIARTHROSES-FREELY
MOVABLE
JOINTS(
SYNOVIAL)
• SYNARTHROSES AND AMPHIARTHROSES ARE
LARGELY RESTRICTED TO THE AXIAL SKELETON
• DIARTHROSES PREDOMINATE IN THE LIMBS
TYPES OF SYNOVIAL JOINTS
• 1. PLANE JOINTS-ARTICULAR SURFACES
ARE PLANE AND ALLOW ONLY GLIDING
MOVEMENTS
• 2. HINGE JOINTS-CYLINDRICAL SURFACE
OF ONE JOINT FITS IN THE TROUGH SHAPE
OF THE OTHER. ALLOW MOVEMENT
AROUND 1 AXIS
• 3. PIVOT JOINTS- THE ROUNDED END OF
ONE BONE FORMS INTO A RING FORMED
BY THE OTHER BONE PLUS A
LIGAMENT.MOVEMENT OCCURS IN 1 AXIS
TYPES OF SYNOVIAL JOINTS
• 4. CONDYLOID- THE EGG SHAPED
SURFACE OF ONE BONE FITS INTO THE
CONCAVE SURFACE OF THE OTHER
.ALLOW MOVEMENT IN 2 AXIS
• 5.SADDLE-ARTICULAR SURFACES IF BOTH
BONES ARE CONCAVE AND CONVEX(
SADDLE) BIAXIAL JOINT.
• 6. BALL AND SOCKET-SPHERICAL HEAD OF
ONE BONE FITS INTO THE SOCKET OF THE
OTHER. MUTIAXIAL JOINT
Synarthrotic Joints
• No joint capsule and no
movement between adjacent
bones
– Suture
• Dense Fibrous CT
– Gomphosis
• Fibrous Peridontal Ligaments
– Synchondrosis – Hyaline
Cartilage
• Epiphyseal Line (plate)
– Synostosis – Bony Joints
(Fused)
Types of Sutures
synchodroses
SYMPYHSIS
Synovial Joint
pg 215
SYNOVIAL JOINT
BALL AND SOCKET
Knee Joint
• Much more complex than
elbow
• Much less stable than
other hinge joints
• Some gliding and rotation
• structurally 3 separate
joints
• No single joint capsule
Joint Shapes
• Saddle: articular surface
both concave + convex
– side-to-side, back-forth
movement
– (eg) carpometacarpal jt of
thumb
–
• Ball + Socket: spherical
head + round socket
– multiaxial movement
– (eg) shoulder, femur
Bursae & Tendon Sheaths
• Bursae: flat, fibrous sac
w/synovial membrane
lining
• Tendon Sheaths:
elongated bursae that
wraps around tendons
• 3 Factors in Joint
Stability:
pg 219
– Muscle Tone
– Ligaments
– Fit of Articular Surface
Joint
Shapes
• Hinge: cylindrical end of 1
bone fits into trough shape of
other
– angular movement-1 plane
(eg) elbow, ankle,
interphalangal
• Plane: articular surface in flat
plane
– Short gliding movement
– (eg) intertarsal, articular
processes of vertebrae
Joint
Shapes
• Condyloid: egg-shape
articular surface + oval
concavity
– side-to-side, back+forth
movement
– (eg) metacarpophalangeal
(knuckle)
• Pivot: round end fits into ring
of bone + ligament
– rotation on long axis
Representative Articulations
Temporomandibular Joint
Mostly hinge joint, some gliding and rotation
Articular disc
Special Movements
BIAXIAL JOINT(CONDYLOID/
SADDLE JOINT)
ELBOW JOINT
MUTIAXIAL JOINTS
MUTIAXIAL JOINTS(HIP JOINT)
BALL AND SOCKET
MOVEMENTS AT SYNOVIAL
JOINTS(FLEXION/EXTENSION)
FLEXION/EXTENSION VETEBRAL
COLUMN
FLEXION EXTESION LIMBS
ADDUCTION/ABDUCTION/
CIRCUMDUCTION
INVERSION/EVERSION
Tendon Sheaths and Bursae
• Bursa
is
saclike
extension of joint capsule
that extends between
nearby
structures
allowing them to slide
more easily past each
other
• Tendon
sheaths
are
elongated cylinders of
connective tissue lined
with synovial membrane
& wrapped around a
tendon
BURSAE AND TENDON
SHEATHS
QUESTIONS
Q-1) Rotatory movements of joints take
place on:
a)Transverse axis
b)Vertical axis
c)Anteroposterior axis
d)All of the above
QUESTIONS
Q-2) Most important factor for stability of
joint is:
a)Fibrous Capsule
b)Ligaments
c)Atmospheric Pressure
d)Surrounding muscle
QUESTIONS
Q-3) All of the following are examples of
saddle joint except:
a)Sterno-clavicular joint
b)Wrist joint
c)Calcaneo-cuboid joint
d)Incudo-malleolar joint
QUESTIONS
Q-4) All of the following are characteristic
features of a synovial (diarthrodial) joint
except:
a)Articular surface are covered by a articular
cartilage
b)Have joint cavity filled with synovial fluid
for lubrication
c)Mostly are freely movable joints
d)Articular cartilage are covered by synovial
membrane
QUESTIONS
Q-5) Articular cartilage of all of the following
joints are made up of thin plate of
fibrocartilage except:
1-Temporomandibular joint
2-1st Carpometacarpal joints
3-Sternoclavicular joint
4-Acramio- clavicular joint
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