Selected Kinematics

Define arthrokinematics

the movement between joint surfaces

What are the motions that describe the movement of one joint surface on another?

roll

glide

spin

Define roll

one joint surface rolling on another

Give an example of a roll in the human body

movement between the femoral and tibial articular surfaces of knee

Define glide

consists of pure translatory motion of one surface gliding on another

Give an example of a glide in the human body

movement of the joint surface of the proximal phalanx at the head of the metacarpal bone of the hand

Define a spin

consists of rotation of the movable component of the joint

Give an example of spin in the human body

movement between joint surfaces of radial head with humerus

True or False: Combination of all three motions can occur at joints

True

Define osteokinematics

movement between two bones

Define the convex concave rule

describes relationship between arthrokinematics and osteokinematics

Describe what happens when a convex surface is moving on a fixed concave surface

the convex surface moves opposite to the direction of the shaft of the bony lever

Describe what happens when a concave surface is moving on a fixed convex surface

the concave articulating surface moves in the same direction as the bony lever

Describe the convex concave rule in the spine

the convex rule applies at the atlantooccipital joint

below the second vertebra the concave rule applies