17
HUMAN ANATOMY
Skeletal System
HEALTHY
JOINT
LATE
ARTHRITIS
EARLY
ARTHRITIS
Arthritis
Wear and tear on joints can lead
to osteoarthritis. In a 7-year clinical
trial, researchers found that yoga is
safe and eective in managing both
osteoarthritis and rheumatoid arthritis
(see p.37). After an 8-week yoga
class, participants showed a reduction
in pain by 25 percent, along with
statistically signicant improvements
in physical tness and quality of life.
THE POSES
Yoga asanas move joints in all
directions. Visualize or try doing
these poses to experience the joint
actions in your body. Imagine or
feel each joint action internally.
CHILD’S POSE
DANCER
Knee flexion
Hip flexion
Spinal
flexion
Hip flexion and
adduction
Shoulder
internal rotation
Hip extension
Knee extension
Shoulder
external
rotation
Ankle dorsiflexion
Ankle plantar flexion
Shoulder
extension
Knee flexion
Spinal extension
Smooth cartilage
Synovial fluid
cushions joint
Space
in joint
Cartilage degrades
Joint space
narrows Bone spur
Bone surfaces meet
Cyst in
bone
Inflamed
membrane
PROGRESSION
As cartilage degrades there is
less space in the joint, leading
to inflammation and pain. Bone
spurs or osteophytes can form as
the condition progresses.
US_016-017_Skeletal_03.indd 17 02/11/2018 14:01
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