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Knee Joint

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...

Structural Classification of Joints

Structural Classification of Joints

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...

Functional Classification of Joints

Functional Classification of Joints

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 immobile...

One-Degree-of-Freedom System

One-Degree-of-Freedom System

In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...

Development of the Limb Synovial Joints

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
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Kinematic Equations: Problem Solving

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Related Experiment Video

Updated: May 8, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

A joint-constraint model-based system for reconstructing total knee motion.

Hsin-Chen Chen, Chia-Hsing Wu, Chien-Kuo Wang

IEEE Transactions on Bio-Medical Engineering

|August 22, 2013

Summary

This study introduces a novel 2-D-3-D registration system for reconstructing total knee motion. The joint-constrained model ensures smooth, physiologic knee movement patterns, crucial for understanding knee disorders.

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Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

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Last Updated: May 8, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

Area of Science:

Biomechanics
Medical Imaging
Orthopedics

Background:

Understanding knee motion is vital for diagnosing knee disorders.
Accurate reconstruction of knee joint movement is challenging with conventional methods.

Purpose of the Study:

To develop a novel 2-D-3-D registration system for reconstructing total knee motion.
To improve the accuracy and physiologic relevance of knee motion analysis.

Main Methods:

A joint-constrained model incorporating bone geometries and articulated joints was created from multi-postural MRI.
Hierarchical registration of bone segments to fluoroscopic video using a modified chamfer matching algorithm.
Femorotibial and patellofemoral joint constraints maintained articulation during registration.

Main Results:

The system achieved smooth and physiologically plausible knee motion sequences.
Joint-space interpolation enabled dense generation of intermediate postures for animation.
Mean registration errors for femur, tibia, and patella were below 1.5 mm.

Conclusions:

The proposed 2-D-3-D registration system accurately reconstructs total knee motion.
The joint-constraint model ensures realistic articulation, improving knee disorder research.
Validated effectiveness through simulation, cadaver, and in vivo testing.