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Related Concept Videos

Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

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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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Rotation with Constant Angular Acceleration - II01:16

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Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
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Kinematic Equations: Problem Solving01:15

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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...
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Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

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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. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
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Stability of structures01:14

Stability of structures

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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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[Rationale of kinematic alignment].

H Windhagen1

  • 1Orthopädische Klinik der Medizinischen Hochschule Hannover im DIAKOVERE Annastift, Anna-von Borries Str. 1-6, 30625, Hannover, Deutschland. henning.windhagen@diakovere.de.

Der Orthopade
|June 27, 2020
PubMed
Summary
This summary is machine-generated.

Kinematic alignment restores natural knee function by replicating the femoral flexion-extension axis. This approach enhances knee stability and patella tracking, leading to improved long-term outcomes.

Keywords:
FemurGaitKinematicsTibiaTotal knee replacement

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Knee arthroplasty

Background:

  • Kinematic alignment is a surgical philosophy for knee prosthesis implantation.
  • It defines the knee's three-dimensional axis using the femoral flexion-extension axis.
  • This axis is centered within the posterior femoral condyles.

Purpose of the Study:

  • To evaluate the principles and outcomes of kinematic alignment in knee arthroplasty.
  • To understand how kinematic alignment restores natural knee biomechanics.

Main Methods:

  • Utilizing a three-dimensional approach to define the femoral flexion-extension axis.
  • Balancing the tibia relative to the femur in extension and flexion.
  • Assessing individual knee laxities in flexion and deep flexion.

Main Results:

  • Limb reconstruction follows the constitutional leg axis, often differing from the straight hip-knee-ankle axis.
  • Natural knee joint lines, frequently oblique, are reconstructed.
  • Restored natural knee stability and maintained native patella kinematics.

Conclusions:

  • Kinematic alignment reconstructs constitutional leg axes, potentially leading to oblique joint lines.
  • This method restores natural knee stability and patella tracking.
  • Despite static concerns, dynamic analysis shows reduced adductor moments and favorable long-term clinical results.