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Related Concept Videos

Kinematic Equations - I01:26

Kinematic Equations - I

14.4K
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:
14.4K
Knee Joint01:23

Knee Joint

3.1K
The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
3.1K
Kinematic Equations - II01:17

Kinematic Equations - II

13.1K
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...
13.1K
Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

785
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...
785
Kinematic Equations - III01:18

Kinematic Equations - III

10.4K
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,...
10.4K
Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

27.5K
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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Related Experiment Video

Updated: Jan 23, 2026

Reverse Total Shoulder Arthroplasty
10:10

Reverse Total Shoulder Arthroplasty

Published on: July 5, 2011

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Total Knee Arthroplasty Kinematics.

Marc R Angerame1, David C Holst2, Jason M Jennings3

  • 1Illinois Bone and Joint Institute, Barrington, IL.

The Journal of Arthroplasty
|June 24, 2019
PubMed
Summary
This summary is machine-generated.

Understanding knee kinematics is crucial for evaluating knee replacement outcomes. Variances between natural and prosthetic knee motion may explain patient dissatisfaction after total knee arthroplasty (TKA).

Keywords:
anterior femoral translationaxial rotationfemoral rollbackfluoroscopic analysiskinematics

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Area of Science:

  • Orthopedic biomechanics
  • Biomechanical analysis of human motion

Background:

  • Knee kinematics analyzes motion patterns for comparative biomechanical assessment.
  • Consensus on implanted knee kinematics and patient outcomes remains elusive.
  • Kinematic differences between native and prosthetic knees may impact total knee arthroplasty (TKA) satisfaction.

Purpose of the Study:

  • To review pertinent information regarding TKA kinematics.
  • To aid surgeons and engineers in understanding diverse prosthetic knee geometries and kinematic profiles.

Main Methods:

  • Review of existing literature on knee kinematics and TKA.
  • Comparative analysis of biomechanical performance data.

Main Results:

  • Significant variability exists in TKA designs and their kinematic profiles.
  • A clear consensus linking specific implanted knee kinematics to patient outcomes has not been established.

Conclusions:

  • Understanding TKA kinematics is essential for improving patient outcomes.
  • Further research is needed to correlate prosthetic knee motion with patient satisfaction and functional success.