Wrist Joint Kinematics and Movements

Dr. K explains the arthrokinematics of the wrist joint, focusing on the radiocarpal and mid-carpal joints. The video covers the structure of the wrist, including the proximal and distal carpal bones, and the joint's two degrees of freedom: flexion/extension and radial/ulnar deviation. It discusses open and closed kinematic chains, providing examples like bending the wrist and doing push-ups. The convex-concave rule is explained, detailing how movements occur in different kinematic chains. The video concludes with a call to action.

Which bones form the proximal row of the carpal bones?

• Metacarpals

• Trapezium, Trapezoid, Capitate, Hamate

• Scaphoid, Lunate, Triquetrum, Pisiform

• Radius and Ulna

Which of the following is true about the mid-carpal joint?

• It is formed between the proximal and distal carpal rows

• It is formed by the radius and the first row of carpal bones

• It allows for pronation and supination

• It is a hinge joint

What are the two degrees of freedom in the wrist joint?

• Flexion and Extension

• Pronation and Supination

• Abduction and Adduction

• Inversion and Eversion

What is an example of an open kinematic chain movement?

• Lifting a heavy object

• Performing a push-up

• Throwing a ball

• Bending your wrist to bring a spoon to the mouth

In an open kinematic chain, what happens during wrist flexion?

• Convex carpals roll anteriorly and glide posteriorly

• Concave radius rolls posteriorly and glides anteriorly

• Convex carpals roll posteriorly and glide anteriorly

• Concave radius rolls anteriorly and glides posteriorly

During radial deviation in an open kinematic chain, how do the carpal bones move?

• Roll radially and glide ulnarly

• Roll ulnarly and glide radially

• Roll posteriorly and glide anteriorly

• Roll anteriorly and glide posteriorly

What happens when a convex object moves on a concave surface?

• Only glide occurs

• Roll and glide occur in the same direction

• Only roll occurs

• Roll and glide occur in opposite directions

In a closed kinematic chain, what is the movement of the distal radius during wrist extension?

• Rolls anteriorly and glides posteriorly

• Rolls anteriorly and glides anteriorly

• Rolls posteriorly and glides posteriorly

• Rolls posteriorly and glides anteriorly

How does the distal radius move during ulnar deviation in a closed kinematic chain?

• Rolls ulnarly and glides ulnarly

• Rolls radially and glides radially

• Rolls posteriorly and glides anteriorly

• Rolls anteriorly and glides posteriorly

What is the role of the distal radius in a closed kinematic chain?

• It is part of the proximal carpal row

• It is fixed and does not move

• It is convex and moves on the concave carpals

• It is concave and moves on the convex carpals