18 Questions
What type of movement occurs when a convex member rolls and slides in opposite directions on a concave surface?
Roll and slide in opposite directions
In arthrokinematic principles, what occurs when a concave member rolls and slides in similar directions on a convex surface?
Roll and slide in similar directions
What happens if motion is reduced according to the text?
Functional disorder occurs
Which joint demonstration involves a combination of roll-and-slide with spin arthrokinematics?
Knee joint
How many degrees of freedom does a joint have if it can swing in one direction or only spin?
1 DOF
Which joint has 3 degrees of freedom allowing it to both spin and swing in two distinct directions?
Shoulder joint
What are the three fundamental types of arthrokinematic movements that occur between curved joint surfaces?
Roll, slide, and spin
In arthrokinematic movements, which type of relationship can exist between two articular surfaces at a joint?
Convex-concave
Which term refers to the motion where one joint surface rolls on another joint surface?
Roll
Which term describes the arthrokinematic motion where one joint surface slides over another?
Slide
What is the direction of movement based on in arthrokinematic principles?
The shape of the joint surfaces
What is the example given in the text for a convex-concave relationship between two articular surfaces?
Humero-ulnar joint at the elbow
What is the term used to describe fixation of the distal segment so that joint motion takes place in multiple planes and the limb is supporting weight?
Closed kinematic chain (CKC)
Which position involves the maximum congruity of opposing joint surfaces and is considered the most stable?
Close-packed position
What is the term for a joint moving less than what is considered normal, or compared to the same joint on the opposite extremity?
Hypomobile
Which term describes all activities involving the end segment of an extremity moving freely through space?
Open kinematic chain (OKC)
Movements away from the close-packed position of a joint involve which element?
Joint distraction
If a joint moves more than what is considered normal, it may be deemed:
Hypermobile
Study Notes
Arthrokinematic Principles
- Convex-on-concave movement occurs when a convex member rolls and slides in opposite directions on a concave surface.
- Concave-on-convex movement occurs when a concave member rolls and slides in similar directions on a convex surface.
Joint Movements
- Reduced motion is characterized by hypomobility.
- The joint demonstration that involves a combination of roll-and-slide with spin arthrokinematics is the radio-humeral joint.
Degrees of Freedom
- A joint with one degree of freedom can swing in one direction or only spin.
- A joint with three degrees of freedom, like the shoulder joint, can spin and swing in two distinct directions.
Arthrokinematic Movements
- The three fundamental types of arthrokinematic movements that occur between curved joint surfaces are roll, slide, and spin.
Joint Relationships
- In arthrokinematic movements, a convex-concave relationship can exist between two articular surfaces at a joint.
- Rolling occurs when one joint surface rolls on another joint surface.
- Sliding occurs when one joint surface slides over another.
Arthrokinematic Directions
- The direction of movement is based on the shape and orientation of the joint surfaces.
Joint Examples
- The example of a convex-concave relationship between two articular surfaces is the shoulder joint.
Fixation
- Weight-bearing fixation occurs when the distal segment is fixed, allowing joint motion to take place in multiple planes and the limb to support weight.
Close-Packed Position
- The close-packed position of a joint involves the maximum congruity of opposing joint surfaces and is considered the most stable.
Hypomobility and Hypermobility
- Hypomobility refers to a joint moving less than what is considered normal or compared to the same joint on the opposite extremity.
- Hypermobility occurs when a joint moves more than what is considered normal.
Open-Chain Movements
- Open-chain movements describe all activities involving the end segment of an extremity moving freely through space.
Joint Movement Elements
- Movements away from the close-packed position of a joint involve the rotation of the joint surfaces.
Explore the concepts of osteokinematic and arthrokinematic motions in joint kinematics. Learn about the axis of rotation for osteokinematic motions and examples of osteokinematic motion like abduction, adduction, flexion, and side flexion.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
