30 Questions
What is the primary function of the distal radioulnar joint?
To facilitate forearm pronosupination
Which of the following bones are part of the proximal carpal row?
Scaphoid, Lunate, Triquetrum
What type of joint is the radiocarpal joint?
Ellipsoid joint
What is the function of the pisiform bone?
To enhance the power of the flexor carpi ulnaris
How many degrees of freedom does the wrist complex have?
2 degrees of freedom
What type of joint is the intercarpal/midcarpal joint?
Compound joint
What is the function of the radiocarpal joint?
To provide radial/ulnar deviation and flexion/extension
What is the concave rule applied to in the distal radioulnar joint?
Radius
What type of movement occurs during pronation in the distal radioulnar joint?
Palmar rolling and gliding
What is the function of the wrist complex?
To control multi-articular muscles of the hand and fine adjustment of the grip
Which of the following movements occurs in the sagittal plane?
Dorsal flexion
What is the range of motion for ulnar/cubital deviation?
35-40º
In open kinematic chain, what is the direction of roll and glide in flexion?
Roll anterior, glide posterior
Which of the following joints has a concave surface?
Radiocarpal joint
What is the purpose of the convex rule in arthrokinematics?
To state that roll and glide occur in opposite directions
Which movement occurs in the frontal plane?
Radial deviation
What is the main difference between open kinematic chain and osteokinematics?
Open kinematic chain is related to joint movement, while osteokinematics is related to bone movement
What type of stability is provided by the capsule in the wrist?
Static stability
What is the range of motion for palmar flexion?
85º
Which of the following compartments contains the capitate and hamate bones?
Medial compartment
What is the function of the synovial membrane in the wrist joint?
To produce synovial fluid to reduce friction between the articulating structures
What is a notable feature of the ligaments of the wrist?
None of them are truly extracapsular
What is the function of the triangular fibrocartilage complex (TFCC)?
All of the above
What is the location of the triangular fibrocartilage complex (TFCC)?
On the medial aspect of the wrist region
What is the function of the scapholunate ligament?
To connect the scaphoid bone to the lunate bone in the wrist
What can be a result of an untreated scapholunate ligament injury?
Chronic wrist problems such as arthritis or carpal instability
What type of movements are facilitated by the triangular fibrocartilage complex (TFCC)?
Complex movements at the wrist joint
What is the primary function of the ligaments in the wrist joint?
To stabilize the wrist joint
What is the purpose of the radial and ulnar collateral ligaments?
To stabilize the radiocarpal joint
What is the result of an injury to the scapholunate ligament?
Instability of the wrist joint
Study Notes
The Wrist Complex
- Functions: control of multi-articular muscles of the hand and fine adjustment of grip
- Degrees of freedom: 2 (radial/ulnar deviation, flexion/extension)
Joints of the Wrist Complex
- Distal radioulnar joint: pivot joint with concave rule (radius moves)
- Radiocarpal joint: ellipsoid joint with 2 axes, convex rule
- Midcarpal/intecarpal joints: plane synovial joints that interconnect each carpal bone
Intercarpal-Midcarpal Joints
- Compound joint with three or more articulation surfaces
- Two single functional units: proximal row (scaphoid-lunate-triquetrum) and distal row (trapezium-trapezoid-capitate-hamate)
Wrist Osteokinematics
- Movements:
- Palmar flexion: 85° transversal plane
- Dorsal flexion: 85° transversal plane
- Ulnar/cubital deviation: 35-40° frontal plane
- Radial deviation: 15° frontal plane
Wrist Arthrokinematics
- Open kinetic chain:
- Flexion/extension: roll anterior/gliding posterior
- Radial/ulnar deviation: roll radial/gliding ulnar
Wrist Stability
- Static stability: capsule, ligaments, and synovial membrane
- Dynamic stability: palmar and dorsal musculature of the wrist
The Triangular Fibrocartilage Complex (TFCC)
- Load-bearing structure that stabilizes radiocarpal and ulnocarpal joints
- Prevents ulnocarpal abutment and facilitates complex wrist movements
Learn about the functions and movements of the wrist complex, including control of multi-articular muscles, fine adjustment of grip, and degrees of freedom. This quiz covers the principles of kinesitherapy.
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