Arthrokinematics Flashcards
Convex
- curved or rounded outward
Concave
- hollowed or rounded inward
Convex-concave relationship -
a. Increases contact surface area of the joint
b. Contributes to increased joint stability
c. Increases dissipation of contact forces
d. Helps guide motion b/t the bones
Roll
a tire rotating (rolling) across the pavement
a. Femoral condyles rolling on tibial plateau
b. Occurs in the direction of movement
c. Occurs on incongruent surfaces
d. Usually in combination with sliding or spinning
Slide
- (glide) a stationary tire sliding on a stretch of icy pavement
a. Carpal bones sliding along their facet surfaces
b. The more congruent the surfaces are, the more sliding there is
Spin
- a spinning top on one spot on the floor
a. The head of the radius at the humeroradial joint during pronation and supination
Distraction and Longitudinal Traction
- joint surfaces are pulled apart
a. Use to stretch a joint capsule and mobilize a joint
b. Hip distraction/longitudinal traction
c. Spinal Longitudinal traction
Compression
- decrease in the space b/t two joint surfaces
a. Adds stability to a joint
b. Normal response to a muscle contraction
c. Push
Convex on Concave
- When the concave side of a joint is stabilized (anchored) the convex joint surface slides (glides) in the opposite direction as it rolls
Concave on Convex
- When the convex side of a joint is stabilized (anchored) the concave joint surface slides (glides) in the same direction as it rolls
Mobilizing a joint:
to restore movement requires that the clinician apply external forces to the joint that facilitate (restore) the natural arthrokinematic motions at the joint
Accessory Movements
- the name given to the arthrokinematic movements within the joint and surrounding tissues that are necessary for normal joint range of motion, but cannot be performed voluntarily
Joint play
- motions that occur within the joint but only as a response to an outside force
