The type of joints, where movement takes place about a single stationary axis, and is largely restricted to o… - ESIC Nursing Officer-7July 2024

ESIC Nursing Officer-7July 2024

Applied Physiology

Easy

Appeared in: ESIC Nursing Officer-7July 2024

Explanation

Hinge joints are defined by their ability to move around a single, fixed transverse axis.
This uniaxial movement is restricted to one plane, typically allowing for flexion and extension, much like a door hinge.
The question's description of movement 'about a single stationary axis' and 'restricted to one plane' perfectly matches the definition of a hinge joint.
Classic examples of hinge joints include the elbow, knee, and interphalangeal joints of the fingers and toes.

Option A: Plane joints have flat articular surfaces that permit gliding or sliding movements in multiple directions, not rotation around a single fixed axis. They are considered non-axial or multiaxial.
Option C: Ellipsoid joints are biaxial, meaning they allow movement around two axes (flexion/extension and abduction/adduction). This contradicts the 'single stationary axis' criterion.
Option D: Saddle joints are also biaxial. Their unique saddle shape allows for movement in two planes, similar to but more extensive than ellipsoid joints.

Visual 1: Animated GIF - An animation showing the flexion and extension movement of an elbow joint to illustrate the single-plane motion of a hinge joint.
Visual 2: Diagram - A comparative chart illustrating the axes of movement (uniaxial, biaxial, multiaxial) with clear examples for each type of synovial joint.
Visual 3: 3D Model - An interactive 3D model of the knee joint, allowing the user to see how the femur and tibia articulate and move only in the sagittal plane.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of Synovial Joints as background academic context rather than a clinical decision trigger.
Understanding joint classification is fundamental for nurses performing physical assessments, particularly when evaluating a patient's Range of Motion (ROM). A goniometer is used to measure these joint angles precisely.
Knowledge of normal joint movement helps in identifying pathologies such as arthritis, dislocations, or ligamentous injuries, which can restrict or alter a joint's normal plane of motion.
What if? - If a patient post-stroke presents with 'foot drop,' the nurse understands this affects the ankle joint (a hinge joint). Interventions would focus on exercises to improve dorsiflexion and plantar flexion and using an ankle-foot orthosis (AFO) to maintain a neutral position.

How to Approach the Question

First, dissect the key phrases in the question: 'single stationary axis' and 'restricted to one plane'.
Recognize that 'single axis' and 'one plane' point to the definition of a uniaxial joint.
Next, review the options provided and classify each based on its axes of movement.
Recall or deduce that Hinge joints (like the elbow) are the primary example of a uniaxial joint allowing movement in one plane (flexion/extension).
Eliminate the other options: Plane joints are non-axial/multiaxial, while Ellipsoid and Saddle joints are biaxial.
Conclude that 'Hinge joints' is the only option that fits the specific criteria described in the question.

Concept Tested & Keywords

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