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Related Concept Videos

Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

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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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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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Kinematic Equations - II01:17

Kinematic Equations - II

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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...
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Kinematic Equations - I01:26

Kinematic Equations - I

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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:
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Kinematic Equations - III01:18

Kinematic Equations - III

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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,...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
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[Kinematic Alignment].

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Current evidence base for kinematic alignment.

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Related Experiment Video

Updated: Dec 18, 2025

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
06:52

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field

Published on: May 26, 2020

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[PSI-technique for kinematic alignment].

P Savov1, M Ettinger2, L-R Tuecking2

  • 1Orthopädische Klinik der Medizinischen Hochschule Hannover im DIAKOVERE Annastift, Anna-von-Borries-Str. 1-7, 30625, Hannover, Deutschland. peter.savov@diakovere.de.

Der Orthopade
|June 17, 2020
PubMed
Summary
This summary is machine-generated.

Patient-specific instrumentation (PSI) using 3D-printed cutting blocks precisely implements kinematic alignment for knee replacements. This technique enhances anatomical restoration and shortens operating time, though it doesn't assess soft tissue status.

Keywords:
3D printingKinematicsSurgical timeTomography, x‑ray computedTotal knee replacement

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Last Updated: Dec 18, 2025

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Kinematic alignment in knee replacement offers superior patient-specific anatomical restoration compared to traditional methods.
  • A key challenge is intraoperative control of bone resections with conventional tools.
  • Patient-specific instrumentation (PSI) utilizes CT-based 3D-printed cutting blocks to bridge preoperative planning and surgical execution.

Purpose of the Study:

  • To detail the surgical technique for kinematic alignment protected by patient-specific instrumentation (PSI).
  • To highlight the use of 3D-printed cutting blocks for precise intraoperative bone resection.
  • To evaluate the efficacy of PSI in achieving patient-specific knee arthroplasty.

Main Methods:

  • Preoperative 3D modeling of patient anatomy guides surgical planning, including implant positioning and bone resection.
  • Individualized 3D-printed cutting blocks are manufactured based on the 3D model and resection plan.
  • Intraoperative verification of bone resections is performed using a gage against the digital 3D design.

Main Results:

  • 3D-printed PSI cutting blocks enable accurate implementation of the kinematic alignment preoperative plan.
  • The technique is straightforward and cost-effective.
  • Surgical duration is reduced compared to conventional instrumentation methods.

Conclusions:

  • PSI-protected kinematic alignment allows for precise, patient-specific knee arthroplasty.
  • The method is efficient and cost-effective, reducing operative time.
  • A limitation is the lack of soft tissue information due to the purely CT-based design.