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Related Concept Videos

Center of Mass: Introduction01:03

Center of Mass: Introduction

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Any object that obeys Newton's second law of motion is made up of a large number of infinitesimally small particles. Objects in motion can be as simple as atoms or as complex as gymnasts performing in the Olympics. The motion of such objects is described about a point called the center of mass of the object. The center of mass of an object is a point that acts as if the whole mass is concentrated at that point. The center of mass of an object with a large number of infinitesimally small...
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Significance of Center of Mass01:12

Significance of Center of Mass

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The center of mass of an object is defined as the mass-weighted average position of all the particles that comprise the object. The significance of the center of mass of an object can be seen by looking at its dynamics. The time derivative of the center of mass gives its velocity, assuming that the object's mass remains constant over time. Furthermore, the total linear momentum of an object can be seen as the linear momentum of a single particle of the object's total mass moving with...
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Center of Gravity00:58

Center of Gravity

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The center of gravity (COG) of an object is the point where the object's total weight is considered to be concentrated. Knowing the location of the center of gravity is useful when predicting the behavior of a moving object or designing static structures. In a uniform gravitational field, the center of gravity is similar to the center of mass (COM); yet, these two points can be positioned differently. For example, the Moon's center of mass lies very close to its geometric center, but...
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Finding the Center of Gravity01:03

Finding the Center of Gravity

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The center of gravity of a body is an imaginary point where the body's total weight is assumed to be concentrated, and the body is perfectly balanced. The center of the mass of a body is a point at which the whole of the mass of the body appears to be concentrated. If the acceleration due to gravity, g, has the same value at all points on a body, its center of gravity is identical to its center of mass. The center of gravity of homogeneous bodies such as a sphere, cube, or rectangular plate...
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Center of Gravity01:15

Center of Gravity

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The center of gravity is the point at which an object's weight appears to be concentrated and can be used to balance the object perfectly. This point is essential in mechanics as it provides information regarding a body's stability and moments of inertia. The center of gravity does not always have to fall within the shape or boundaries of the body; it may also lie outside the body in certain cases.
To determine its location, the principle of moments can be utilized by dividing the object into...
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Center of Mass00:59

Center of Mass

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The center of mass is the point at which the total mass of an object can be said to be concentrated. It is a fundamental principle in mechanics and physics that applies to all objects regardless of their shape or size. The center of gravity is the point at which an object’s weight appears to be concentrated and can be used to balance the object perfectly.
The knowledge of the center of mass can also help us to describe and predict the motion of objects. For example, when a ball is thrown...
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Related Experiment Video

Updated: Apr 19, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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The high hip center.

Kevin J Bozic1, Andrew A Freiberg, William H Harris

  • 1Department of Orthopaedic Surgery, University of California-San Francisco, 500 Parnassus, MU 320W, San Francisco, CA 94143-0728, USA. bozick@orthosurg.ucsf.edu

Clinical Orthopaedics and Related Research
|April 2, 2004
PubMed
Summary
This summary is machine-generated.

Revision hip arthroplasty can be challenging due to bone loss. A high hip center, positioning the acetabular component superiorly, can be a successful reconstruction technique when the anatomic center is unattainable.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Arthroplasty

Background:

  • Acetabular component revision after total hip arthroplasty presents significant surgical challenges.
  • Severe bone stock deficiency and distorted anatomy often prevent restoring the native hip center.

Purpose of the Study:

  • To evaluate the utility of a high hip center as a reconstruction technique for deficient acetabula in revision hip arthroplasty.

Main Methods:

  • Review of surgical options for acetabular reconstruction in cases of component loosening.
  • Analysis of biomechanical implications of superiorly displaced hip centers.
  • Assessment of clinical outcomes related to proximal hip center placement.

Main Results:

  • Superior displacement of the hip center, unlike superolateral placement, does not appear to adversely affect hip joint forces.
  • Proximal placement enhances contact with viable host bone, potentially reducing the need for bone grafts.
  • This technique can increase the likelihood of stable bony ingrowth and implant fixation.

Conclusions:

  • A high hip center is a viable and useful technique for reconstructing the deficient acetabulum in patients with a loose acetabular component.
  • Proper patient selection and meticulous surgical technique are crucial for successful outcomes with this approach.