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Functional Classification of Joints01:09

Functional Classification of Joints

8.7K
Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
8.7K
Structural Classification of Joints01:20

Structural Classification of Joints

8.3K
Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
8.3K
Method of Joints: Problem Solving II01:30

Method of Joints: Problem Solving II

1.1K
Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
1.1K
Method of Joints: Problem Solving I01:30

Method of Joints: Problem Solving I

1.8K
The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
1.8K
Wilcoxon Signed-Ranks Test for Matched Pairs01:09

Wilcoxon Signed-Ranks Test for Matched Pairs

561
The Wilcoxon signed-rank test for matched pairs evaluates the null hypothesis by combining the ranks of differences with their signs. It essentially tests whether the median of the differences in a population of matched pairs is zero. Since the test incorporates more information than the sign test, it generally yields more trustable conclusions. This test also does not require the data to follow a normal distribution, but two conditions must be met for it to be applicable: (1) the data must...
561
Kendall's Coefficient of Concordance01:20

Kendall's Coefficient of Concordance

1.1K
Kendall's Coefficient of Concordance (W), also known as Kendall's W, is a non-parametric statistical measure used to assess the agreement or concordance between multiple raters or judges when they rank a set of items. It is often used when you have ordinal data (ranks) and you want to see if there is consistency or consensus among the raters. It is widely applied in research areas such as psychology, medicine, and social sciences, where multiple judges are asked to rank or rate subjects...
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Related Experiment Video

Updated: Mar 13, 2026

A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers
12:39

A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers

Published on: January 18, 2020

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Interconverting the Joint Awareness Score and the Forgotten Joint Score: A Crosswalk Analysis.

Emma N Horton1, Lauren K Holbrook1, David F Scott1,2

  • 1Spokane Joint Replacement Center Inc., Spokane, WA, USA.

Arthroplasty Today
|March 12, 2026
PubMed
Summary

The Joint Awareness Score (JAS) is a user-friendly alternative to the Forgotten Joint Score (FJS) for patients. This study validates the JAS for total hip and knee arthroplasty patients, showing strong correlation and a near-linear conversion.

Keywords:
Forgotten Joint ScoreJoint Awareness ScorePatient-reported outcome measure

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Area of Science:

  • Orthopedics
  • Patient-Reported Outcomes
  • Arthroplasty

Background:

  • Patient awareness of artificial joints is key to satisfaction after total joint arthroplasty.
  • The Forgotten Joint Score (FJS) is commonly used but may be difficult for English speakers.
  • The Joint Awareness Score (JAS) is a shorter, 6-question alternative for hip and knee arthroplasty patients.

Purpose of the Study:

  • To validate the Joint Awareness Score (JAS) as a streamlined alternative to the Forgotten Joint Score (FJS).
  • To assess the internal consistency and correlation of the JAS with the FJS.
  • To establish a crosswalk for converting JAS scores to FJS scores.

Main Methods:

  • A crosswalk analysis was performed between the JAS and FJS.
  • Patients undergoing primary total hip and knee arthroplasty were included.
  • Data were collected preoperatively and at 6 weeks, 6 months, and 1 year postoperatively.

Main Results:

  • The JAS demonstrated acceptable internal consistency (Cronbach's alpha: 0.76-0.89).
  • Strong correlations were found between JAS and FJS (Pearson's r: 0.75-0.88).
  • Crosswalk analysis showed a near-linear relationship (Spearman's rho: 0.88-0.90).

Conclusions:

  • The JAS is a shorter, more user-friendly tool for American English-speaking patients.
  • A nearly direct conversion exists between the JAS and FJS.
  • The JAS is a viable alternative for assessing joint awareness in arthroplasty patients.