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Related Concept Videos

Kinematic Equations - III01:18

Kinematic Equations - III

The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
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...
Static Equilibrium - I01:05

Static Equilibrium - I

A rigid body is said to be in dynamic equilibrium when both its linear and angular acceleration are zero, relative to an inertial frame of reference. This means that a body in equilibrium can be moving, but only when its linear and angular velocities are constant. A rigid body is said to be in static equilibrium when it is at rest in the selected frame of reference. The distinction between static equilibrium (e.g., a state of rest) and dynamic equilibrium (e.g, a state of uniform motion) is...
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 - I01:26

Kinematic Equations - I

When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
Kinetic Friction01:26

Kinetic Friction

Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car begins...

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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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Published on: April 11, 2018

Do dynamic-based MR knee kinematics methods produce the same results as static methods?

Agnes G d'Entremont1, Jurek A Nordmeyer-Massner, Clemens Bos

  • 1Department of Mechanical Engineering, Centre for Hip Health and Mobility, University of British Columbia, Canada. agnesgd@interchange.ubc.ca

Magnetic Resonance in Medicine
|August 1, 2012
PubMed
Summary
This summary is machine-generated.

Dynamic magnetic resonance imaging (MRI) of knee motion provides distinct 3D kinematic results compared to static MRI scans. This dynamic approach captures essential joint movement data not obtainable from static positions, improving knee kinematics assessment.

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Area of Science:

  • Biomechanics
  • Medical Imaging
  • Orthopedics

Background:

  • Magnetic resonance imaging (MRI) offers noninvasive joint assessment but often relies on static poses or repetitive movements.
  • Static MRI methods may not fully represent the complex, continuous nature of joint kinematics during dynamic activities.

Purpose of the Study:

  • To compare 3D knee kinematic results from sequential static MRI poses with those from continuous dynamic MRI.
  • To evaluate the agreement between validated static MRI methods and a novel dynamic MRI technique.

Main Methods:

  • Ten healthy volunteers underwent knee imaging using three MRI methods: dynamic, standard static, and fast static.
  • Kinematic data from static and dynamic MRI sequences were analyzed and compared.

Main Results:

  • Static MRI methods (standard and fast) showed agreement, suggesting interchangeability.
  • Dynamic MRI kinematic results differed significantly from static results in eight of eleven measured parameters.
  • Key differing parameters included patellar and tibial translations and rotations.

Conclusions:

  • Dynamic 3D MRI of knee motion yields significantly different kinematic data compared to static MRI.
  • Dynamic MRI provides unique insights into knee joint kinematics that are not captured by static imaging techniques.
  • Dynamic MRI represents a more comprehensive approach for assessing knee joint kinematics.