Wrist and Hand Complex Biomechanics Quiz

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Questions and Answers

Explain the factors that contribute to the variability of the range of motion (ROM) in the carpal complex.

The ROM of the carpal complex is variable due to differences in carpal kinematics, which could be attributed to ligamentous laxity, the shape of articular surfaces, and the constraining effect of muscles.

What advantages does a 2-joint complex offer over a single joint complex in providing mobility and stability?

A 2-joint complex provides a large ROM with less exposed articular surfaces and a tighter joint capsule, less tendency for structural pinch at extreme ranges, and flattened multijoint surfaces that are more capable of withstanding imposed pressures.

What structures form the wrist and hand complex?

The wrist and hand complex is formed by the radius and radioulnar discs as a part of the triangular fibrocartilage complex (TFCC) proximally, and the scaphoid, lunate, and triquetrum distally.

Describe the characteristics of the distal radius joint surface.

<p>The distal radius has a single continuous biconcave curvature that is long and shallow side to side, and sharper and shorter anteroposteriorly.</p> Signup and view all the answers

What does the proximal joint surface consist of?

<p>The proximal joint surface consists of the lateral.</p> Signup and view all the answers

Flashcards

Carpal ROM variability

Range of motion (ROM) in the wrist varies due to factors like ligament flexibility, joint shape, and muscle tension.

2-joint complex advantage

A 2-joint structure offers more movement with reduced joint injury risk compared to a single-joint structure.

Wrist and hand complex structures

The wrist and hand include the radius (and associated discs), triangular fibrocartilage complex (TFCC), and carpal bones (scaphoid, lunate, triquetrum).

Distal radius joint surface

The distal part of the radius bone has a long, shallow side-to-side curve, and a shorter, sharper front-to-back curvature.

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Proximal joint surface

The proximal joint surface of the wrist contains the lateral side.

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Study Notes

Wrist and Hand Complex Biomechanics

The hand consists of 5 digits: 1 thumb and 4 fingers.
The hand has 8 carpal bones.
The hand complex has 19 bones and 19 joints distal to the carpal bones.

Joints in the Digits

Each digit has a carpometacarpal joint (CMC) and a metacarpophalangeal joint (MCP).
Each finger has 2 interphalangeal joints: one distal (DIP) and one proximal (PIP).
The thumb has only 1 interphalangeal joint.

Wrist Joint

The wrist consists of 2 joints: radiocarpal joint and midcarpal joint.

Functions of the Wrist Complex

The wrist complex controls the length-tension relationship in multiarticular hand muscles.
The wrist complex allows for fine adjustments of grip.
Wrist muscles are designed for balance and control, rather than maximizing torque production.
The wrist complex is biaxial, with motions of flexion/extension (coronal axis) and ulnar deviation/radial deviation (AP axis).

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Description

Test your knowledge of the wrist and hand complex biomechanics with this quiz. Learn about the structure, bones, and joints of the hand, including the carpal bones, carpometacarpal joint, and metacarpophalangeal joint.