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Related Concept Videos

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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.
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Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.
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Structural Joints: Synovial Joints01:16

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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Structural Joints: Fibrous Joints01:03

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
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Structural Joints: Cartilaginous Joints01:17

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
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Joints01:26

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Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
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Related Experiment Video

Updated: Feb 5, 2026

Tissue Collection and RNA Extraction from the Human Osteoarthritic Knee Joint
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REPEATIBILITY AND RELIABILITY OF KNEE JOINT ROTATIONAL LAXITY MEASUREMENTS WITH DOUBLE GONIOMETRY.

Alan Albanese1, Miroljub Jakovljević1

  • 1University of Ljubljana, Faculty of Health Sciences, Ljubljana, Slovenia.

Acta Clinica Croatica
|February 4, 2026
PubMed
Summary

This study found that double magnetic goniometry offers good repeatability and reliability for measuring knee joint rotational laxity. While promising, further technical improvements are needed for clinical application.

Keywords:
Double goniometryKnee jointRange of motionRotational laxity

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Kinesiology

Background:

  • Existing research on knee joint rotation range of motion presents conflicting findings.
  • Optimal methods for measuring knee rotation remain undetermined, impacting clinical assessment and research.
  • Accurate measurement of knee rotational laxity is crucial for diagnosing injuries and guiding rehabilitation.

Purpose of the Study:

  • To evaluate the repeatability and reliability of knee joint rotational laxity measurements.
  • To assess the effectiveness of using two magnetic goniometers for this purpose.
  • To provide data that can inform the development of standardized measurement techniques.

Main Methods:

  • Thirty healthy participants (15 male, 15 female) aged 20-32 years were recruited.
  • Internal and external knee rotation of both legs were measured twice using double magnetic goniometry.
  • Measurements were taken in a seated position with the knee flexed at 90 degrees.

Main Results:

  • No significant differences were observed between the first and second measurement sessions.
  • Intraclass correlation coefficients (ICC) for repeatability ranged from 0.812 to 0.858, indicating good to very good consistency.
  • ICC values for reliability ranged from 0.655 to 0.837, also demonstrating good to very good reliability.

Conclusions:

  • Double magnetic goniometry shows good to very good repeatability and reliability for measuring rotational knee laxity.
  • The measurement technique yielded results that differ from some previously reported values.
  • Further technical advancements are necessary to facilitate the widespread clinical adoption of this method.