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Joints
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What is a Joint? A location where two bones make contact
Allow movement Provide support
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Joint Classification Classified structurally and functionally
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Joint Classification STRUCTURALLY Fibrous Cartilaginous Synovial
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Joint Classification FUNCTIONAL Synarthrosis Amphiartrosis Diarthrosis
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Fibrous Joints Connected by dense connective tissue (collagen)
Fixed/immovable Skull
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Cartilaginous Joints Connected only by cartilage Form growth regions
Spinal column Sternum
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Synovial Joints Bones are separated by a cavity filled with fluid
There are 6 Gliding Condyloid Saddle Hinge Ball and socket Pivot
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Gliding Smooth movement in many directions with a smooth surface
Hand and foot
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Condyloid Irregular surface where bones are gliding past each other
Wrist
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Saddle Two bones that fit together Bending motion Thumb
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Hinge Form between 2 bones Flex and extend Elbow
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Ball and Socket Allow stable movements in several directions
Bending in several directions Hip joint
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Pivot Rotational motion occurs without gliding Heads range of motion
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Bursae & Tendon Sheaths
Associated with synovial joints Bags of lubricant Located near tendons/ligaments/joints
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Bunion Bunion- enlarged bursa at the base of the big toe, swollen from rubbing
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Bursae & Tendon Sheaths
Tendon sheath- elongated bursa that wraps around a tendon Subject to friction
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Joint Injuries Sprain Ligaments reinforcing a joint are stretched or torn
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Joint Injuries Cartilage Injuries
Snap/pop of cartilage when working out Cartilage is avascular (cant repair itself)
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Joint Injuries Dislocations Bones forced out of alignment
Subluxation- partial dislocation
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Arthritis Over 100 different types Most widespread crippling disease
1/7 Americans
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Osteoarthritis Most common chronic arthritis Related to aging
Enzymes break down cartilage Progresses slowly Aspirin, therapy
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Rheumatoid Arthritis Arises between 40-50 Joint stiffness Flare-ups
Autoimmune (body attacks itself) Reaction is unknown (bacteria?)
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Gouty Arthritis Uric acid levels rise and can’t be excreted properly
Bones can fuse and immobilize joint Patients need to control diet (promoting uric acid production)
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