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Related Concept Videos

Types of Friction Problems01:27

Types of Friction Problems

Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
The first type of dry friction problem involves situations where there is no apparent impending motion.
Knee Joint01:23

Knee Joint

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 group...
Frictional Force01:07

Frictional Force

When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
Friction: Problem Solving01:21

Friction: Problem Solving

Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...
Dry Friction01:30

Dry Friction

Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...

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Related Experiment Video

Updated: Jun 23, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

Friction couples in total hip replacement.

N Passuti1, Jm Philippeau, F Gouin

  • 1Orthopedic and Traumatic Surgery Department, pôle osteoarticulaire, Nantes Teaching Hospital, Hôtel-Dieu, 1, place Alexis-Ricordeau, 44093 Nantes cedex, France. norbert.passuti@chu-nantes.fr

Orthopaedics & Traumatology, Surgery & Research : OTSR
|May 16, 2009
PubMed
Summary
This summary is machine-generated.

Total hip replacement (THR) longevity is limited by wear debris, causing osteolysis. Current friction couples like alumina-alumina and metal-metal have drawbacks, necessitating long-term clinical validation for improved patient outcomes.

Related Experiment Videos

Last Updated: Jun 23, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
09:51

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Wear Debris Analysis

Background:

  • Total hip replacement (THR) implant lifespan is limited by wear debris, leading to osteolysis and reduced longevity in active patients.
  • While femoral and acetabular anchorage has improved, wear particle generation remains a critical issue.
  • Various friction couples (alumina-alumina, metal-metal, advanced polyethylene) are used, each with unique tribological properties and limitations.

Purpose of the Study:

  • To review the current challenges and advancements in friction couple technology for total hip replacement.
  • To evaluate the performance and limitations of different bearing surfaces, including ceramic, metal, and advanced polyethylene options.
  • To emphasize the need for long-term clinical validation of new bearing couple technologies.

Main Methods:

  • Review of existing literature on total hip replacement bearing surfaces and wear debris.
  • Analysis of tribological properties, biocompatibility, and mechanical integrity of different friction couples.
  • Discussion of clinical implications and the necessity for prospective studies.

Main Results:

  • Alumina-alumina couples offer low friction but face challenges with acetabular anchorage and fracture risk.
  • Metal-metal couples exhibit good tribology but release ions (Co, Cr) with potential systemic effects.
  • Highly crosslinked polyethylene shows reduced wear but requires long-term clinical monitoring to avoid issues seen with previous enhanced polyethylenes.

Conclusions:

  • No single friction couple is ideal; choices depend on patient activity and surgeon preference.
  • Long-term (over five years) prospective clinical studies are essential to validate the efficacy and safety of new bearing couples.
  • Further research and validation are needed to provide orthopedic surgeons with a reliable selection of friction couples for diverse patient needs.