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Related Concept Videos

Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

646
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...
646
Kinematic Equations - III01:18

Kinematic Equations - III

10.1K
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,...
10.1K
Kinematic Equations - II01:17

Kinematic Equations - II

12.6K
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...
12.6K
Kinematic Equations - I01:26

Kinematic Equations - I

13.9K
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:
13.9K
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

787
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
787
Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

27.1K
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...
27.1K

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Related Experiment Video

Updated: Dec 19, 2025

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
06:09

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

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Current evidence base for kinematic alignment.

L-R Tuecking1, P Savov2, H Windhagen2

  • 1Department für Endoprothetik, Diakovere Annastift, Orthopädische Klinik der Medizinischen Hochschule Hannover, Anna-von-Borries-Str. 1-6, 30625, Hannover, Germany. lars-rene.tuecking@diakovere.de.

Der Orthopade
|June 9, 2020
PubMed
Summary
This summary is machine-generated.

Kinematic alignment is a newer option for total knee arthroplasty (TKA). This review summarizes current research comparing kinematic alignment to traditional mechanical alignment in TKA procedures.

Keywords:
Alternative alignmentImplant survivalMechanical alignmentReviewTotal knee arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical device technology

Background:

  • Kinematic alignment is an emerging alternative to mechanical alignment in total knee arthroplasty (TKA).
  • Recent literature increasingly compares intentional kinematic alignment with traditional mechanical alignment.
  • The number of studies on kinematic alignment has significantly increased in the last five years.

Purpose of the Study:

  • To provide a narrative overview of the current literature.
  • To explore the ongoing debate between kinematic and mechanical alignment in TKA.

Main Methods:

  • Literature review of studies comparing kinematic and mechanical alignment in TKA.
  • Analysis of existing research on implant survival and clinical outcomes.
  • Synthesis of findings from recent comparative studies.

Main Results:

  • The review synthesizes current evidence on the comparison between kinematic and mechanical alignment.
  • It highlights the growing body of research in this field.
  • Identifies key areas of focus in the ongoing debate.

Conclusions:

  • Kinematic alignment is a significant development in TKA.
  • Further research is needed to fully understand its long-term implications compared to mechanical alignment.
  • The debate between these alignment techniques continues to evolve.