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Related Concept Videos

Kinematic Equations - II01:17

Kinematic Equations - II

The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
Ankle Joint01:10

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...

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Related Experiment Video

Updated: Jun 6, 2026

Measurements of Motor Function and Other Clinical Outcome Parameters in Ambulant Children with Duchenne Muscular Dystrophy
09:18

Measurements of Motor Function and Other Clinical Outcome Parameters in Ambulant Children with Duchenne Muscular Dystrophy

Published on: January 12, 2019

Joint Angular Kinematics and Gross Motor Function in Typically Developing Healthy Children.

Monday Omoniyi Moses1, Ngozi Florence Onuegbu1, Prince De-Gualle Deku1

  • 1Department of Physiotherapy and Sports Science, Faculty of Allied Health Sciences, College of Health Sciences, Kwame Nkrumah University of Science & Technology, Kumasi AK-039, Ghana.

Children (Basel, Switzerland)
|March 28, 2025
PubMed
Summary
This summary is machine-generated.

This study found a negative correlation between joint movement and gross motor skills in young Ghanaian children. Promoting range of motion and flexibility is key for developing children

Keywords:
anthropometriccrawling and kneelinglying and rollingrange of motionrunning and jumpingwalking

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Published on: January 12, 2019

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Area of Science:

  • Pediatric physical therapy
  • Motor development research
  • Biomechanics in children

Background:

  • Understanding the relationship between joint kinematics and gross motor function is crucial for assessing child development.
  • Limited research exists on these interactions in West African populations.

Purpose of the Study:

  • To investigate the associations between specific joint angular kinematics and gross motor function levels in healthy, typically developing Ghanaian children aged 2-4 years.

Main Methods:

  • A descriptive cross-sectional study involved 150 children (69 boys, 81 girls).
  • Standardized scales were used to measure joint angular kinematic variables (hip, knee, ankle) and gross motor function domains (lying, sitting, crawling, standing, locomotion).

Main Results:

  • Significant correlations were observed between specific joint movements and gross motor function categories.
  • For instance, right hip extension (RHE) and left ankle plantar flexion (LAPF) showed positive correlations with lying and rolling.
  • Left knee extension (LKE) and right ankle dorsi-flexion (RADF) demonstrated significant, though sometimes negative, correlations across various motor function levels.

Conclusions:

  • A negative correlation exists between joint angular kinematics and overall gross motor function in this cohort.
  • Interventions focusing on range of motion, flexibility, and active transportation are recommended to enhance gross motor skills and promote active lifestyles in children.