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Toledo PT Analysis Chapter 1
Toledo PT Analysis Chapter 1 Terms
23
Science
Professional
09/20/2009

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Term
Biomechanics
Definition
Discipline that uses principles of physics to quantitatively study how forces interact within a living body.
Term
Kinematics
Definition
Branch of mechanics that describes the motion of a body without regard to forces or torques that may produce a motion.
Term
Translation
Definition
describes a linaear mtion in which all parts of a rigid body move parallel to and in the same direction as every other part of the body.
Term
T/F. Translation can occur in a straight line or a curved line?
Definition
True.
Term
Rotation
Definition
Describes a motion in which a rigid body m oves in a circular path about some pivot point.
Term
T/F. All synovial joints in the body possess at least some translation, driven actively by muscle or passively owing to the natural laxity wihtin th estructure of the joint
Definition
True.
Term
Accessory motions
Definition
slight passive translations that occur in most joints
Term
Arthrokinematics
Definition
Describes the motion that occurs between the articular surfaces of joints.
Term
What do convex/concave relationships provide for joints?
Definition
Improves their congruency, increases the surface area for dissipating contact forces, and helps guide the motion between the bones.
Term
Close-packed position
Definition
Position of maximal congruency. In this position most ligaments and parts of the capsule are pulled taut, providing an element of natural stability to the joint. Accessory joints minimal.
Term
Loose-Packed position
Definition
all positions other than a joint's close-packed position. Ligaments and capsules are relatively slackened allowing an increase in accessory movements. Least congruent.
Term
Kinetics
Definition
Branch of mechanics that describes the effect of forces on the body.
Term
T/F A force is directly proportional to the acceleration of the mass.
Definition
True.
Term
Stress
Definition
Denotes the internal resistance generated as a tissue resists its deformation divided by its cross-sectional area.
Term
Strain
Definition
Ratio of tissue's deformed length to its original length
Term
Is plastic energy recoverable from a muscle?
Definition
no
Term
Viscoelastic
Definition
Tissues when the stress-strain curve changes as a function of time.
Term
Creep
Definition
Describes the progressive streain of a material when exposed to a constant load over time.
Term
Agonist
Definition
Muscle or muscel group that is most directly related to the initiation and execution of a particular movement.
Term
Antagonist
Definition
Muscle or muscle group that is considered to have the opposite action of a particular agonist.
Term
Synergist
Definition
A pair of muscles when they cooperate during the execution of a particular movement.
Term
Force Couple
Definition
formed when two or more muscles simultaneously produce forces in different linear directions, although the torques act in the same rotary direction.
Term
Mechanical Advantage
Definition
Ratio of Internal moment arm to external moment arm.
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